An investigation into the incident by the Russian prosecutor's office of the Chechen Republic in under way, ITAR-TASS reported. Criminal proceedings have also been initiated in connection with the incident, the Russian news agency said.

According to Chechen police, the explosion happened at 11:10 p.m. Sunday, ITAR-TASS reported. It struck officers of the district's Interior Ministry as well as a patrol service regiment that was on duty. The explosion was detonated by a radio-controlled device at a crossroads.