Boston Marathon bombing aftermath: Search for clues amid memorials

Authorities have reviewed countless photo and video evidence provided by the public as well as surveillance video from businesses near the finish line to aid their investigation into the twin bombs that exploded at the Boston Marathon on Monday. The crime scene also has been flooded with tributes for the victims.


Y! News: Latest updates on Boston Marathon bombing | Watch: Details of developments | Controversial Time cover | Photos: Horrific images after explosions

Investigators comb through the post finish line area of the Boston Marathon at Boylston Street, two days after two bombs exploded just before the finish line, Wednesday, April 17, 2013, in Boston. (AP Photo/Julio Cortez)

This image from a Federal Bureau of Investigation and Department of Homeland Security joint bulletin issued to law enforcement and obtained by The Associated Press, shows the remains of a pressure cooker that the FBI says was part of one of the bombs that exploded during the Boston Marathon. The FBI says it has evidence that indicates one of the bombs was contained in a pressure cooker with nails and ball bearings, and it was hidden in a backpack. (AP Photo/FBI)

This image from a Federal Bureau of Investigation and Department of Homeland Security joint bulletin issued to law enforcement and obtained by The Associated Press, shows the remains of a black backpack that the FBI says contained one of the bombs that exploded during the Boston Marathon. The FBI says it has evidence that indicates one of the bombs that exploded in the Boston Marathon was contained in a pressure cooker with nails and ball bearings, and it was hidden in a backpack. (AP Photo/FBI)

Two men in hazardous materials suits put numbers on the shattered glass and debris as they investigate the scene at the first bombing on Boylston Street in Boston Tuesday, April 16, 2013 near the finish line of the 2013 Boston Marathon, a day after two blasts killed three and injured over 170 people. The bombs that ripped through the Boston Marathon crowd were fashioned out of ordinary kitchen pressure cookers, packed with nails and other fiendishly lethal shrapnel, and hidden in duffel bags left on the ground, people close to the investigation said Tuesday. (AP Photo/Elise Amendola)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: Flowers are placed beside a National Guardsman's vehicle near the scene of twin bombings at the Boston Marathon on April 17, 2013 in Boston, Massachusetts. The explosions, which occurred near the finish line of the 116-year-old Boston race on April 15, resulted in the deaths of three people with more than 170 others injured. Security has been heightened across the nation as the search continues for the person or people behind the bombings. (Photo by Spencer Platt/Getty Images)

Jillian Blenis, 30, of Boston, reacts while stopping at a makeshift memorial, Wednesday, April 17, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the Boston Marathon. (AP Photo/Julio Cortez)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: A woman looks at a street memorial near the scene of twin bombings at the Boston Marathon on April 17, 2013 in Boston, Massachusetts. The explosions, which occurred near the finish line of the 116-year-old Boston race on April 15, resulted in the deaths of three people with more than 170 others injured. Security has been heightened across the nation as the search continues for the person or people behind the bombings. (Photo by Spencer Platt/Getty Images)

A note is left at a shrine to the victims of the Boston Marathon explosions in Boston, Massachussetts, April 17, 2013. (Lesley Clark/MCT via Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: Workers prepare to take down barriers along Boylston Street near the scene of the Boston Marathon bombing April 17, 2013 in Boston, Massachusetts. Boston continues to return to normal, as businesses and streets are reopened following two bomb explosions at the finish line of the marathon that killed 3 people and injured over a hundred more. (Photo by Darren McCollester/Getty Images)

Cailly Carroll reads signs posted on a barricade, Wednesday, April 17, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the Boston Marathon. (AP Photo/Julio Cortez)

A sign hangs from a barricade on Boylston Street near the finish line of the Boston Marathon, Wednesday, April 17, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the marathon. (AP Photo/Julio Cortez)

Robert Bakoian, 38, of Boston, reflects near a makeshift memorial on Boylston Street, Wednesday, April 17, 2013, in Boston. The city continues to cope following Monday's explosions near the finish line of the Boston Marathon. (AP Photo/Julio Cortez)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: A man and woman leave after pausing at the makeshift memorial on Boylston Street to the victims of the Boston Marathon bombing April 17, 2013 in Boston, Massachusetts. Boston continues to return to normal, as businesses and streets are reopened following two bomb explosions at the finish line of the marathon that killed 3 people and injured over a hundred more. (Photo by Darren McCollester/Getty Images)

An investigator combs through trash pulled from a vin just beyond the Boston Marathon finish line on Boylston Street, two days after two bombs exploded just before the finish line, Wednesday, April 17, 2013, in Boston. Authorities investigating the deadly bombings have recovered a piece of circuit board that they believe was part of one of the explosive devices, and also found the lid of a pressure cooker that apparently was catapulted onto the roof of a nearby building, an official said Wednesday. (AP Photo/Julio Cortez)

An investigator combs through trash pulled from a vin just beyond the Boston Marathon finish line on Boylston Street, two days after two bombs exploded just before the finish line, Wednesday, April 17, 2013, in Boston. Authorities investigating the deadly bombings have recovered a piece of circuit board that they believe was part of one of the explosive devices, and also found the lid of a pressure cooker that apparently was catapulted onto the roof of a nearby building, an official said Wednesday. (AP Photo/Julio Cortez)

Boston Deals With Aftermath Of Marathon Explosions

MEDFORD, MA - APRIL 17: Flowers and a sign are left on a street post in Medford Square in remembrance of Krystle Campbell, 29, of Medford, Massachusetts, who was killed by the bomb explosions at the Boston Marathon on April 17, 2013 in Medford, Massachusetts. The explosions, which occurred near the finish line of the 116-year-old Boston race on April 15, resulted in the deaths of three people with more than 170 others injured. (Photo by Jared Wickerham/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: A street is closed near the scene of twin bombings at the Boston Marathon on April 17, 2013 in Boston, Massachusetts. The explosions, which occurred near the finish line of the 116-year-old Boston race on April 15, resulted in the deaths of three people with more than 170 others injured. Security has been heightened across the nation as the search continues for the person or people behind the bombings. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: People walk to work past a flag flying at half-staff near the scene of twin bombings at the Boston Marathon on April 17, 2013 in Boston, Massachusetts. The explosions, which occurred near the finish line of the 116-year-old Boston race on April 15, resulted in the deaths of three people with more than 170 others injured. Security has been heightened across the nation as the search continues for the person or people behind the bombings. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: A member of the Federal Bureau of Investigation (FBI) searches for clues near the scene of twin bombings at the Boston Marathon on April 17, 2013 in Boston, Massachusetts. The explosions, which occurred near the finish line of the 116-year-old Boston race on April 15, resulted in the deaths of three people with more than 170 others injured. Security has been heightened across the nation as the search continues for the person or people behind the bombings. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: Members of the Federal Bureau of Investigation (FBI) search for clues near the scene of twin bombings at the Boston Marathon on April 17, 2013 in Boston, Massachusetts. The explosions, which occurred near the finish line of the 116-year-old Boston race on April 15, resulted in the deaths of three people with more than 170 others injured. Security has been heightened across the nation as the search continues for the person or people behind the bombings. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: Members of the Federal Bureau of Investigation (FBI) search for clues near the scene of twin bombings at the Boston Marathon on April 17, 2013 in Boston, Massachusetts. The explosions, which occurred near the finish line of the 116-year-old Boston race on April 15, resulted in the deaths of three people with more than 170 others injured. Security has been heightened across the nation as the search continues for the person or people behind the bombings. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: Recovery workers, including members of the Federal Bureau of Investigation (FBI), search for clues near the scene of twin bombings at the Boston Marathon on April 17, 2013 in Boston, Massachusetts. The explosions, which occurred near the finish line of the 116-year-old Boston race on April 15, resulted in the deaths of three people with more than 170 others injured. Security has been heightened across the nation as the search continues for the person or people behind the bombings. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: Members of the Federal Bureau of Investigation (FBI) search for clues near the scene of twin bombings at the Boston Marathon on April 17, 2013 in Boston, Massachusetts. The explosions, which occurred near the finish line of the 116-year-old Boston race on April 15, resulted in the deaths of three people with more than 170 others injured. Security has been heightened across the nation as the search continues for the person or people behind the bombings. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: Recovery workers, including members of the Federal Bureau of Investigation (FBI), search for clues near the scene of twin bombings at the Boston Marathon on April 17, 2013 in Boston, Massachusetts. The explosions, which occurred near the finish line of the 116-year-old Boston race on April 15, resulted in the deaths of three people with more than 170 others injured. Security has been heightened across the nation as the search continues for the person or people behind the bombings. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: Investigators stand at the scene of twin bombings at the Boston Marathon on April 17, 2013 in Boston, Massachusetts. The explosions, which occurred near the finish line of the 116-year-old Boston race on April 15, resulted in the deaths of three people with more than 170 others injured. Security has been heightened across the nation as the search continues for the person or people behind the bombings. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: Investigators stand at the scene of twin bombings at the Boston Marathon on April 17, 2013 in Boston, Massachusetts. The explosions, which occurred near the finish line of the 116-year-old Boston race on April 15, resulted in the deaths of three people with more than 170 others injured. Security has been heightened across the nation as the search continues for the person or people behind the bombings. (Photo by Spencer Platt/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: FBI crime scene investigators sweep up Boylston Street just past Berkeley Street towards the scene of the bombing looking for evidence April 17, 2013 in Boston, Massachusetts. Investigators continue to work the scene of two bomb explosions at the finish line of the marathon that killed 3 people and injured over one hundred more. (Photo by Darren McCollester/Getty Images)

Officials stand guard near the site of the Boston Marathon explosions, Wednesday, April 17, 2013, in Boston. Authorities investigating the deadly bombings have recovered a piece of circuit board that they believe was part of one of the explosive devices, and also found the lid of a pressure cooker that apparently was catapulted onto the roof of a nearby building, an official said Wednesday. (AP Photo/Julio Cortez)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: FBI crime scene investigators look for evidence just off Boylston Street near Berkeley Street April 17, 2013 in Boston, Massachusetts. Investigators continue to work the scene of two bomb explosions at the finish line of the marathon that killed 3 people and injured over one hundred more. (Photo by Darren McCollester/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: FBI crime scene investigators photograph evidence after placing a marker on Boylston Street just past Berkeley Street April 17, 2013 in Boston, Massachusetts. Investigators continue to work the scene of two bomb explosions at the finish line of the marathon that killed 3 people and injured over one hundred more. (Photo by Darren McCollester/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON - APRIL 17: FBI crime scene investigators sweep up Boylston Street after placing an evidence marker down just past Berkeley Street April 17, 2013 in Boston, Massachusetts. Investigators continue to work the scene of two bomb explosions at the finish line of the marathon that killed 3 people and injured over one hundred more. (Photo by Darren McCollester/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: An evidence marker placed by FBI crime scene investigators sits on Boylston Street just past Berkeley Street April 17, 2013 in Boston, Massachusetts. Investigators continue to work the scene of two bomb explosions at the finish line of the marathon that killed 3 people and injured over one hundred more. (Photo by Darren McCollester/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: FBI crime scene investigators sweep up Boylston Street after placing an evidence marker just past Berkeley Street April 17, 2013 in Boston, Massachusetts. Investigators continue to work the scene of two bomb explosions at the finish line of the marathon that killed 3 people and injured over one hundred more. (Photo by Darren McCollester/Getty Images)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON, MA - APRIL 17: FBI crime scene investigators sweep up Boylston Street after placing an evidence marker just past Berkeley Street April 17, 2013 in Boston, Massachusetts. Investigators continue to work the scene of two bomb explosions at the finish line of the marathon that killed 3 people and injured over one hundred more. (Photo by Darren McCollester/Getty Images)

What to Read Next