The bomber who carried out a terrorist attack in the Moscow subway's Park Kultury station was a female suicide bomber, Russia's top investigator said.

Vladimir Markin said that the "black-haired female" terrorist was in the car where the blast occurred.

The blast in the Park Kultury station was equivalent of 1.5 kg of TNT packed in a plastic explosive device.

Two blasts in Moscow's subway stations Lubyanka and Park Kultury occurred during rush hour with an interval of 40 minutes, the first one at approximately 8:00 a.m. According to preliminary information, at least 35 people have died and dozens were injured in the early morning blast.

A police source said earlier the bomb at the Moscow Park Kultury station was detonated at 100-120 centimeters in height, or at approximately chest level.

At least 12 people died and another 23 were injured in the blast in the Park Kultury station.

Markin said investigators have removed the CCTV recordings from the scenes of the explosions.

Emergency services are working at the scene and investigations are still underway.

MOSCOW, March 29 (RIA Novosti)