A subway train hit by a explosion stays at the Tekhnologichesky Institut subway station in St.Petersburg, Russia, Monday, April 3, 2017. The subway in the Russian city of St. Petersburg is reporting that several people have been injured in an explosion on a subway train.

ST. PETERSBURG, Russia (AP) — Coverage of the explosion on a train in the Russian city of St. Petersburg (all times local):

Updated 5:25 p.m.: A spokesman for Russia’s top anti-terror agency says law enforcement agents have found and defused another explosive device on St. Petersburg’s subway.

Andrei Przhezdomsky said the improvised explosive was found Monday on Ploshchad Vosstaniya station. He made the statement about two hours after a blast on a subway train in St. Petersburg killed at least 10 and wounded dozens of others.

Updated 5:20 p.m.: Russia’s National Anti-Terrorism Committee says it has found and deactivated a bomb at another St. Petersburg subway station.

Updated 5:10 p.m.: German Foreign Minister Sigmar Gabriel says he learned of the deadly explosion in St. Petersburg “with deep sorrow.”

Although the cause of the explosion has not been confirmed, Gabriel says it appeared to be “a perfidious attack against innocent people.”

Updated 4:35 p.m.: Russian President Vladimir Putin says investigators were looking into whether the St. Petersburg subway explosion was a terror attack or if there might have been some other cause.

He says: “Law enforcement agencies and intelligence services are doing their best to establish the cause and give a full picture of what happened.”

Putin happened to in St. Petersburg for a meeting with Belarusian leader Alexander Lukashenko.

Updated 4:15 p.m.: Russia’s National Anti-Terrorism Committee has announced that security will be tightened at all critical transport facilities following St. Petersburg blast.

Updated 3:55 p.m.: Andrei Kibitov, spokesman for the St. Petersburg governor, has told Russian television 10 people have been killed and 50 injured in the subway explosion.

In Moscow, Deputy Mayor Maxim Liksutov told the Interfax news agency that Moscow authorities are tightening security on the subway in the Russian capital.

Updated 3:45 p.m.: Russian news agencies Tass and Interfax report 10 dead in blast on train in St. Petersburg subway.

Video footage posted on social media website shows a train with mangled doors standing at the platform. Frantic commuters reach out into the doors and windows, trying to see if anyone is there and shouting “Call an ambulance!”

Russian Senator Viktor Ozerov tells Interfax that the explosion looks like a terrorist attack.

Updated 3:30 p.m.: The subway in the Russian city of St. Petersburg is reporting that several people have been injured in an explosion on a subway train.

The subway’s administration says several stations in the northern Russian city have been closed and that an evacuation is underway Monday afternoon.

Social media users posted photographs from one subway station in the city center, showing people lying on the floor and a train with a mangled door nearby.

Russian news agencies quoted Kremlin spokesman Dmitry Peskov saying that Russian President Vladimir Putin has been informed about the explosion. Putin is visiting the city Monday and is expected to hold talks with the Belarusian president later in the day.

In this image taken from video footage, emergency services work outside Sennaya Square metro station in St Petersburg, Russia, Monday, April 3, 2017. At least 10 people were killed Monday in an explosion on the subway in St. Petersburg, Russian news agencies reported. (AP Photo)Blast victims lie near a subway train hit by a explosion at the Tekhnologichesky Institut subway station in St.Petersburg, Russia, Monday, April 3, 2017. The subway in the Russian city of St. Petersburg is reporting that several people have been injured in an explosion on a subway train. Blast victims lie near a subway train hit by a explosion at the Tekhnologichesky Institut subway station in St.Petersburg, Russia, Monday, April 3, 2017. The subway in the Russian city of St. Petersburg is reporting that several people have been injured in an explosion on a subway train.