Firefighters and rescue workers stand amidst the rubble of destroyed houses after the explosion of a gas tanker truck in San Pedro Xalostoc, on the outskirts of Mexico City May 7, 2013. A gas tanker truck exploded on a highway north of Mexico City early on Tuesday, killing at least 20 people and injuring 36 others as a fireball tore through cars and homes. [Photo/Agencies]
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