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Aerial view shows first responders working next to destroyed homes and vehicles after a gas tanker truck exploded on a highway in the Mexico City suburb of Ecatepec early Tuesday, May 7, 2013. The blast killed and injured dozens, according to the Citizen Safety Department of Mexico State. Officials did not rule out the possibility the death toll could rise as emergency workers continued sifting through the charred remains of vehicles and homes built near the highway on the northern edge of the metropolis. (AP Photo)

Aerial view shows first responders working next to destroyed homes and vehicles after a gas tanker truck exploded on a highway in the Mexico City suburb of Ecatepec early Tuesday, May 7, 2013. The blast killed and injured dozens, according to the Citizen Safety Department of Mexico State. Officials did not rule out the possibility the death toll could rise as emergency workers continued sifting through the charred remains of vehicles and homes built near the highway on the northern edge of the metropolis. (AP Photo)

Deadly gas tank explosion in Mexico City

A natural gas tanker truck lost control and exploded on a highway lined by homes in the Mexico City

suburb of Ecatepec May 7, killing at least 20 people and

injuring nearly three dozen, according to the Citizen Safety Department

of Mexico State.