This is stated on the page office on Twitter.

“We clarify once again - there is no smoke, there is no threat to passengers either. The main reason is the loss of voltage in the contact rail, ”the statement says.

It clarifies that the experts are already conducting repairs and eliminate the consequences of the incident.

The Moscow Metro also indicated that at the moment people stuck in the tunnels are being taken to the stations.

Passengers of one train have already left the station.

- Moscow Metro (@MetroOperativno) May 21, 2019

The passengers of the second train went to the station.

- Moscow Metro (@MetroOperativno) May 21, 2019

Now we are transferring the passengers of the third train to the train that will deliver them to the station. This is the last train left in the tunnel.

- Moscow Metro (@MetroOperativno) May 21, 2019

Passengers go to a working train. pic.twitter.com/wC9FJP6Ahm

- Moscow Metro (@MetroOperativno) May 21, 2019

Earlier, the Moscow Metro reported that three stations of the Moscow Metro: Savyolovskaya, Petrovsky Park and Shelepiha are currently closed for entry.