Five police officers have been killed and two others injured after a bomb exploded next to a police checkpoint in Russia's North Caucasus republic of Chechnya, reported RIA Novosti.
The blast went off in Grozny, the Chechen capital, late on Sunday.
In a separate incident, another police officer was killed in Grozny after unidentified assailants opened fire on two police trucks, carrying eight officers, on Sunday. A search for the gunmen is underway.
Although the active phase of the antiterrorism campaign in the North Caucasus officially ended in 2001, periodic bombings and clashes between militants and federal troops still disrupt Chechnya and nearby regions, including Daghestan and Ingushetia.