At least 20 dead as train overpass collapses in Mexico City

The train carriage was split in two as the metro overpass collapsed in Mexico City (Picture: Reuters)At least 20 people have been killed and dozens more injured after a section of an overpass collapsed in Mexico City.Shocking footage shows a train carriage hanging in the air as rescue teams desperately search for survivors in the wreckage.People were still trapped in the train that split in two earlier this morning, with 34 of around 70 injured people being treated in hospital, Mayor Claudia She