One of the detained after the shooting at...

Four young people, two males and two females have been detained. Three of them were born in 1987 and one in 1990. One of the boys is a student at the Interior Ministry academy and one of the girls is a student at a Moscow economics and law college.

The source said the assailants fled in a Mitsubishi Lancer after opening fire at the Bibiryevo post. No one was hurt in the attack.

The investigation is ongoing.

Moscow has recently seen a rise in crimes committed with non-lethal weapons designed for self-defense. Guns with rubber bullets are much easier to legally get hold of than normal handguns.

Earlier this month a young woman was injured when a rubber bullet hit her during a row between two men in the Moscow subway.

In December 2009, a man shot dead the driver of a snow plough with a non-lethal weapon after the vehicle scratched his car.

MOSCOW, March 23 (RIA Novosti)