Investigators launched on Saturday a criminal probe into an attack on a police patrol in western Moscow which left one officer dead and another badly injured, a police source said.
According to preliminary reports, suspected criminals in a BMW sedan opened fire earlier on Saturday when police officers stopped their car and asked for identification.
The reports said police returned fire at the escaping car and at least one of the passengers may be wounded.
Investigators found a passport belonging to a resident of the North Caucasus republic of Dagestan at the crime scene.
Moscow police have been put on alert and the search for the suspects is underway.
Police cordoned off all exits from the Russian capital and reinforced police squads have been dispatched to the Kuntsevo district where the crime took place, the official said.
MOSCOW, March 13 (RIA Novosti)