Rebels in Chechnya have ambushed an interior troops convoy on a mountain road, killing four and wounding 10 servicemen and police officers, officials said Monday. The attack occurred Sunday in the Vedeno region in Chechnya's southern mountains, said Magomed Deniyev, a spokesman for Chechnya's branch of Russia's Interior Ministry. The attackers fled.Large-scale battles in Chechnya ended years ago, but rebels continue to mount regular hit-and-run raids against federal troops and local Moscow-backed authorities. Other provinces in Russia's volatile North Caucasus also have remained restive, plagued by frequent clashes and attacks on authorities. In the province of Dagestan east of Chechnya, two army soldiers were wounded in a gunbattle with a group of gunmen, said Mark Tolchinksy, a spokesman for the regional branch of Russia's Interior Ministry.