The attack took place in a village in Russia's Stavropol region, close to the volatile majority-Muslim North Caucasus area, where Islamist extremists intent upon carving out a breakaway caliphate have targeted policemen in a series of car bombings and shootings.
               
"An attack took place on a regional police station," a spokesman for the Interior Ministry in Stavropol told a news agency.

"One of the attackers blew himself up, two others were killed."
Initial reports said nobody else - including police officers or civilians had been hurt.
               
Accounts of what happened varied. Some Russian news agencies cited unnamed police sources as saying three suicide bombers had managed to blow themselves up and that there were four attackers in total.
               
The interior ministry spokesman said the authorities had responded to the attack by activating the 'Fortress Plan, which meant police had been put on a higher state of military-style readiness.

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