Appeal after 15 injured in Moscow subway bombing

Russian security services are appealing for witnesses to a rush-hour bombing in the Moscow subway which has left 15 people injured.

Some of the seven victims who were taken to hospital are in a serious condition after the blast on a platform of the Belorusskaya underground station.

The bomb exploded as a train was pulling into the station, shattering stained-glass mosaics and sending chips of marble from a bench flying into a crowd.

Russia's Federal Security Service, the agency in charge of combating terrorism, said the bomb had an explosive equivalent of 200-400 grams of TNT.

Agency spokesman, Andrei Kostromin declined to release any other details of the investigation.

Moscow Mayor Yuri Luzhkov called the explosion a terrorist act, but he did not identify any alleged perpetrators. No claims of responsibility have been made public.

Moscow has seen dozens of bombings over the past several years, but few high-profile cases have been solved.

A bomb exploded in Moscow's Serpukhovskaya subway station in 1996, killing four people and wounding 12.