Gas truck blast outside Mexico City kills 20

Police officers and rescue workers stand at an area damaged by 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 Tuesday, killing at least 22 people and injuring more than 30, the minister of public security in the State of Mexico said. [Photo/Agencies]