Forensic technicians work close to the area where two subway trains collide in Mexico City. There are 57 injured people, some with minor injuries, who in any event went to the hospital. REUTERS

A woman is helped to reach an ambulance after two subway trains collide in Mexico City. The train conductor was the most seriously injured person in the collision, occurred between the Potrero and La Raza stations. REUTERS

Two metro trains collided in a Mexico City tunnel Saturday, killing one person and injuring 57, authorities in the megacity of 20 million reported. REUTERS

Members of rescue teams are seen at the Indios Verdes metro station after two trains collided in Mexico City. At least one person died and 10 injured left this Saturday a collision between two trains of the Mexico City Metro. AFP

A soldier stands guard after two subway trains collide head-on at a subway station, in Mexico City, Mexico. REUTERS