NARO-FOMINSK, Russia (Reuters): A freight train collided with a passenger train near Moscow on Tuesday, ripping the side off one of the carriages and killing at least six people.

Russian officials said the death toll could rise after several carriages were derailed. All of the windows as well as most of the side of one green carriage had gone, a Reuters cameraman on the scene said. Russian television footage showed dazed passengers clambering off the tilting train and climbing up a grassy bank to safety after the accident. The train had been on its way from Moscow to Chisinau, the capital of Moldova, before the collision at around 1230 p.m. (0830 GMT) near the town of Naro-Fominsk, 55 km (34 miles) southwest of the Russian capital. The cause of the accident was not immediately known but a criminal investigation has been opened. “We tried to use an emergency brake. We couldn’t see anything ahead, there was lots of dust. Visibility was zero,” RIA news agency quoted one of the drivers of the passenger train as saying.

An official from state-owned Russian Railways told reporters at the scene that five people had been killed immediately and a sixth had later died in hospital.

Viktor Yatsenko, an official with Russia’s Emergencies Ministry, had earlier told a televised teleconference with other officials that 45 people had been hurt in addition to the dead. He said 15 of the injured were seriously hurt.

Serious accidents on Russia’s 85,000 km (52,800 miles) of rail track are relatively rare but critics say the country’s creaking transportation infrastructure, including its railways, badly need investment and renovation.