*Warning: images may be disturbing to some readers*

**Update: The Interfax agency confirmed the explosive device was left in a briefcase. A new total of 39 injured people remain in hospital.**

Two devastating explosions in the subway system in the Russian city of St. Petersburg are making world news headlines this morning. President Vlademir Putin described it as a "possible terror attack," but says his investigators are looking into possible theories for the subway blast.

Although little information is known as to who is responsible, eyewitnesses Tweeted about the blasts that took between 1:00 p.m. and 2:00 p.m. UTC.

According to The Telegraph, Russia's anti-terrorism committee confirms that 10 people are dead and 30 people have been reported as injured so far.

The first explosion occurred at Sennaya Ploshchad metro station at about 1:08 p.m. UTC, followed by a second blast around 2:40 p.m. UTC, on the blue line of the St. Petersburg subway at the Sadovaya station. The second device reportedly exploded in a subway car.

The device involved in the blasts are believed to have been filled with shrapnel.

According to the Mirror, three subway stations have now been closed. Images are now emerging from eyewitness twitter accounts that show bloodied victims lying on the platform and subway car doors blown apart.