Seven Russian police officers have been killed in an ambush in Chechnya. The Russian interior ministry said the attack happened near Kurchaloi, south-east of the capital, Grozny. The men\'s vehicle came under fire from a grenade launcher. The driver survived and is being treated for shrapnel wounds. Raids by Chechen separatist rebels remain frequent in the North Caucasus republic, which has been devastated by a decade of war. The seven officers killed in the attack were all from the Tver region of central Russia. The local Chechen prosecutor\'s office told a Russian news agency it was the worst attack in recent months. (BBC)