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Explosion in St. Petersburg Metro, several feared dead (GRAPHIC IMAGES)

© сторожевая башня / Twitter

A suspected IED explosion inside a car of the St. Petersburg Metro system has resulted in casualties among passengers, according to the transit system’s management. An evacuation is underway and some stations have been closed for entry.

Preliminary reports indicate that some 10 people may have been killed and 20 injured in the blast, news agencies said citing sources close to the investigation.

The incident reportedly happened at the Sennaya station of the northwestern Russian city’s underground transit system.

View image on TwitterView image on TwitterView image on TwitterView image on Twitter

В Петербурге на станции “Технологический институт” произошёл взрыв в вагоне метро.

The local rescue services told TASS they were responding to the report of the smoke, but could not provide any detail.

At least eight stations of the metro have been closed for passengers.

В метро Санкт-Петербурга произошел взрыв, есть пострадавшие http://ift.tt/2nA422J 

Some of the images show several bodies lying next to the damaged car, with blood apparently spilt on a bench.

RIA Novosti said evacuation of people from the affected area was underway.

Здесь собираем все подробности о взрывеhttp://rtvi.com/news/29020-v-peterburge-proizoshel-vzryv-v-metro 

@RTVi @romabordunov Как минимум три станции метро закрыты, людей толпы, никто ничего не знает.. pic.twitter.com/RFuNzrvVOY

View image on Twitter

The metro management said they received reports of an explosion inside the car, possibly of an improvised explosive device.

Photos taken near the Sennaya Ploshchad station entry showed firefighter vehicles involved in responding to the emergency.