A firefighter leans against the roof of a damaged mini-bus while standing on the beam that fell from a bridge onto the bus during an earthquake, in Mexico City, Tuesday March 20, 2012. A strong 7.4-magnitude earthquake hit central and southern Mexico on Tuesday, collapsing at least 60 homes near the epicenter and a pedestrian bridge in the capital where people fled shaking office buildings. There were no passengers in the mini-bus and the driver suffered minor injuries, according to firefighters. (AP Photo/Alexandre Meneghini)