At least four people were killed when a bridge collapsed onto a passenger train.

How to сообщает Baza, all the victims were passengers on the Klimov-Moscow train.
According to preliminary information, it was an explosion.
At least 44 people were injured.
Survivors are being pulled out through the train car windows. Some people are trapped and are calling for help.
UPD:
Mash сообщаетthat the locomotive and the first four cars derailed.
According to Shot, four people died. were at the epicenter of the explosion.
UPD2:
Moscow Railways stated that the derailment of the passenger train occurred due to the collapse of the bridge's superstructure "as a result of illegal interference with transport operations."
UPD3:
As Mash reports, died the entire locomotive crew of the train.
UPD4:
Among the victims is a five- or six-month-old infant. Doctors say his condition is serious.
According to Baza, there were 379 people on the train in total.

