MOSCOW - Russian police officers killed eight suspected Islamist militants in the volatile North Causcasus region where insurgents are fighting to establish an Islamic state, Russia's anti-terrorism agency said on Thursday.Four were shot dead in a rural region of predominantly Muslim Dagestan, the National Anti-Terrorism Committee said."(The men) opened fire with automatic weapons on law enforcement officials and as a result of the firefight the militants were fatally wounded," the agency said in a statement.