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A picture taken by a cell phone shows rescuers working near a derailed subway train in a tunnel between Park Pobedy and Slavyansky Bulvar stations in Moscow, on July 15, 2014. At least twenty people died and scores more were hurt today after a train derailed in Moscow's packed metro during rush hour in the worst accident to hit one of the world's busiest subways. AFP PHOTO / ITAR-TASS / VARYA VALOVIL/AFP/Getty Images ( 531656385 )

Emergency Ministry firefighters carry an injured man out from a subway station after a rush-hour subway train derailment in Moscow, Russia, on Tuesday, July 15, 2014. (AP Photo/Ivan Sekretarev) ( Russia Subway Derailment )

In this frame grab provided by the Russian Ministry for Emergency Situations shows frame grab from a video showing rescue teams working inside the tunnel where several cars of the wrecked train look almost coiled, occupying the entire space of the tunnel of Moscow subway in Moscow, Russia, on Tuesday, July 15, 2014. Workers were seen trying to force open the mangled doors of the car where dead bodies are supposed to be. A rush-hour subway train derailed in Moscow Tuesday, killing about a dozen people and injuring at least 150, emergency officials said. Several cars left the track in the tunnel after a power surge triggered an alarm, which caused the train to stop abruptly. (AP Photo/Russian Emergency Situation Ministry) ( APTOPIX Russia Subway Derailment )

Paramedics, a police officer and a voluenteer carry an injured man out from a subway station after a rush-hour subway train derailment in Moscow, Russia, on Tuesday, July 15, 2014. (AP Photo/Ivan Sekretarev) ( Russia Subway Derailment )

Paramedics carry an injured man out from a subway station after a rush-hour subway train derailment in Moscow, Russia, on Tuesday, July 15, 2014. (AP Photo/Ivan Sekretarev) ( Russia Subway Derailment )

Paramedics, a police officer and a volunteer carry an injured man out from a subway station after a rush-hour subway train derailment in Moscow, Russia, on Tuesday, July 15, 2014. (AP Photo/Ivan Sekretarev) ( Russia Subway Derailment )

In this frame grab provided by the Russian Ministry for Emergency Situations shows frame grab from a video showing rescue teams working inside the tunnel where several cars of the wrecked train look almost coiled, occupying the entire space of the tunnel of Moscow subway in Moscow, Russia, on Tuesday, July 15, 2014. (AP Photo/Russian Emergency Situation Ministry) ( Russia Subway Derailment )

Paramedics treat passengers injured as several subway cars derailed in Moscow, on July 15, 2014. Dozens have reportedly been as several subway cars in a tunnel between Park Pobedy and Slavyansky Bulvar stations, in the west of Moscow, the Russian media reported today. AFP PHOTO / ITAR-TASS / MIKHAIL JAPARIDZE/AFP/Getty Images ( 531650735 )

Rescuers and paramedics evacuate passengers injured as several subway cars derailed in Moscow, on July 15, 2014. Three people died and dozens were injured today after a train derailed in the Moscow metro in a tunnel between Park Pobedy and Slavyansky Bulvar stations, in the west of Moscow, city authorities said. AFP PHOTO / DMITRY SEREBRYAKOV/AFP/Getty Images ( 531651170 )

Rescuers and paramedics use helicopters to evacuate passengers injured as several subway cars derailed in Moscow, on July 15, 2014. AFP PHOTO / DMITRY SEREBRYAKOV/AFP/Getty Images ( 531651212 )