Two police officers were killed and another...

It quoted an Ingush police spokesman as saying that the suicide bomber set off an explosive device when he was stopped by security guards at the gates of a police station in the town of Karabulak. A police source said the second blast occurred just minutes after the first, no one was killed or injured.

"He [the suicide bomber] arrived in a car and it was presumed the car was mined," local police said. "All security measures were taken and as a result, the police"s fears were confirmed when the car exploded."

Last week two deadly blasts occurred in two Moscow subway stations claiming some 40 lives and injuring dozens more. The attackers struck the Lubyanka and Park Kultury stations about 40 minutes apart during the morning rush hour.

Chechen militant leader Doku Umarov claimed responsibility for the metro attacks, saying in a video message they were revenge for a special operation carried out by federal security forces on February 11, 2010, when 18 militants and

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