World responds to Boston bombing

In the wake of the Boston attacks, several countries, including France and Great Britain, have ordered local authorities to step up security and reinforce measures already in place. 

Seattle Police K9 officer Craig Williamson stands with his explosives detection dog, "Dennis" as he patrols downtown Seattle, Monday, April 15, 2013, in reaction to explosions at the Boston Marathon finish line earlier in the day. A Seattle Police blog posting said that although there was no indication of a direct threat to Seattle, officers would be increasing patrols and activity around the city. (AP Photo/Ted S. Warren)

A law enforcement officer stands post at the U.S. Capitol, Monday, April 15, 2013 in Washington. Authorities say the blasts during the Boston Marathon killed two people and injured at least 73,(AP Photo/Alex Brandon)

United States security officers and the United States embassy with the U.S. flag are reflected in a rain puddle in Berlin, Tuesday, April 16, 2013. On Monday April 15, 2013 two bombs exploded in the crowded streets at the Boston marathon in the United States. (AP Photo/Markus Schreiber)

United States security officers and the United States embassy with the U.S. flag are reflected in a rain puddle in Berlin, Tuesday, April 16, 2013. On Monday April 15, 2013 two bombs exploded in the crowded streets at the Boston marathon in the United States. (AP Photo/Markus Schreiber)

Back dropped by the landmark commonly known as, Big Ben, a warning sign for road closures at the forthcoming London Marathon is displayed along the marathon route in London, Tuesday, April 16, 2013. British police are reviewing security plans for Sunday's London Marathon, the next major international marathon, because of the bombs that killed three people at the marathon in Boston Monday. (AP Photo/Sang Tan)

A New Jersey State Police helicopter flies over Jersey City, N.J., Monday, April 15, 2013. New Jersey is securing its city, which sits along the Hudson River across from New York City, in the wake of explosions near the finish line at the Boston Marathon. (AP Photo/Julio Cortez)

French police officers patrol at the Human Rights Square, near the Eiffel Tower, Paris, Tuesday April 16, 2013. In the wake of the Boston attacks, the French Interior Ministry has ordered local authorities across France to immediately reinforce security measures already in place since the January intervention in Mali began. The ministry did not change the threat level. (AP Photo/Remy de la Mauviniere)

Boston Deals With Aftermath Of Marathon Explosions

BOSTON - APRIL 16: National Guard soldiers patrol at Back Bay Station April 16, 2013 in Boston, Massachusetts. Security is tight in the City of Boston following yesterday's two bomb explosions at the finish of the Boston Marathon, that killed three people and wounding hundreds more. (Photo by Darren McCollester/Getty Images)

A man carries newspapers featuring the Boston marathon blasts on the front page, while waiting to cross a road in central London, Tuesday, April 16, 2013. British police are reviewing security plans for Sunday's London Marathon, the next major international marathon, because of the bombs that killed three people at the marathon in Boston Monday. (AP Photo/Sang Tan)

A commuter reads a newspaper featuring the Boston marathon bomb blasts on the front page, while waiting for a train at East Croydon station in south London, Tuesday, April 16, 2013. British police are reviewing security plans for Sunday's London Marathon, the next major international marathon, because of the bombs that killed three people at the marathon in Boston Monday. (AP Photo/Sang Tan)

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