PHOTOS: Fatal explosion in Russian subway

A picture shows the damaged train carriage at Technological Institute metro station in Saint Petersburg on April 3, 2017. (STR/AFP/Getty Images)

Locals near Tekhnologichesky Institut station of the St Petersburg metro in the aftermath of a blast that hit a train carriage between stations. (Alexander Demianchuk\TASS via Getty Images)

Traffic police officers are shown near crowds at Moskovsky Prospekt Street near the entrance to Tekhnologichesky Institut station of the St Petersburg metro. (Peter Kovalev\TASS via Getty Images)

A woman uses a phone at the entrance to Tekhnologichesky Institut station of the St Petersburg metro in the aftermath of an explosion which occurred in a train on Monday. (Peter Kovalev\TASS via Getty Images)

People use phones at the entrance to Tekhnologichesky Institut station of the St Petersburg metro in the aftermath of an explosion on Monday. (Peter Kovalev\TASS via Getty Images)

A subway train hit by a explosion stays at the Tekhnologichesky Institut subway station in St.Petersburg, Russia, Monday, April 3, 2017. (AP Photo/www.vk.com/spb_today via AP)

An emergency service helicopter and a police car near Tekhnologichesky Institut station of the St Petersburg metro in the aftermath of an explosion which occurred in a train. (Peter Kovalev\TASS via Getty Images)

Emergency services personnel walk at the entrance to Technological Institute metro station in Saint Petersburg on April 3, 2017. (OLGA MALTSEVA/AFP/Getty Images)

In this grab taken from AP video, Russian police officer, left, and people walk past the damaged train at the Tekhnologichesky Institut subway station in St.Petersburg, Russia. (AP video via AP)

A screenshot from an Instagram video shows the scene in St. Petersburg. (Viktoriya.Viktorovna9127/Instagram)

Firefighters and ambulances at the entrance to Sennaya Ploshchad station of the St Petersburg metro in the aftermath of an explosion which occurred in a train. (Sergei Konkov\TASS via Getty Images)

A photo taken by an Instagram user shows the scene inside a smoke-filled Russian subway station. (lemanruss/Instagram)

An explosion in a St. Petersburg subway on Monday has killed at least 14 people and injured more than 40 others.

Russia's health minister revised the death toll on Tuesday from 11 to 14, saying that 49 people were still in the hospital.

The explosion took place between subway stations near Sennaya Square.

This is a developing story. Please check back for updates.