Russian news agencies say the police headquarters building in Ingushetia's principal city came under grenade and automatic weapons fire. No police were injured in the Saturday night attack in Nazran, the ITAR-Tass agency cites the republic's Interior Ministry as saying. ITAR-Tass and Interfax said the attack lasted several minutes. Officials could not immediately be reached for comment by The Associated Press. Ingushetia is plagued by violence variously attributed to criminal gangs and to a spillover of separatist insurgency from neighboring Chechnya.