Adding poignancy and a touch of the surreal, yesterday's magnitude-7.1 quake struck on the 32nd anniversary of the 1985 earthquake that killed thousands. Just hours earlier, people around Mexico had held earthquake drills to mark the date.
One of the most desperate rescue efforts was at a primary and secondary school in southern Mexico City, where a wing of the three-story building collapsed into a massive pancake of concrete slabs. Journalists saw rescuers pull at least two small bodies from the rubble, covered in sheets.
"We saw some chairs and wooden tables. The next thing we saw was a leg, and then we started to move rubble and we found a girl and two adults - a woman and a man," he said.
"We can hear small noises, but we don't know if they're coming from above or below, from the walls above (crumbling), or someone below calling for help."
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Rescuers brought in wooden beams to shore up the fallen concrete slabs so they wouldn't collapse further and crush whatever airspaces remained.
The federal Education Department reported late Tuesday that 25 bodies had been recovered from the school's wreckage, all but four of them children.
It was not clear whether those deaths were included in the overall death toll of 225 reported by the federal civil defense agency. Pena Nieto had earlier reported 22 bodies found and said 30 children and eight adults were reported missing.
People across central Mexico already had rallied to help their neighbors as dozens of buildings tumbled into mounds of broken concrete. Mexico City Mayor Miguel Angel Mancera said buildings fell at 44 sites in the capital alone as high-rises across the city swayed and twisted and hundreds of thousands of panicked people ran into the streets.