Russian authorities said on Thursday that security forces had been put on combat alert in the southern Stavropol region after the discovery of six bodies with gunshot wounds in four different cars, three of which were rigged with explosives.
Only one of the bombs went off and no one was hurt. But the killings are further heightening security concerns ahead of the Winter Olympics in Sochi, which also lies near the Caucasus region, where an Islamic insurgency is simmering.
Russia has already tightened security before next month’s Games, on which President Vladimir Putin has staked a lot of political and personal prestige, and is on high alert after suicide bombers killed at least 34 people in separate attacks in the southern city of Volgograd last month.
The corpses were discovered on Wednesday in two separate districts outside the regional capital Stavropol, a gateway to the North Caucasus, where Russia faces an insurgency by Islamist militants who have threatened to try to prevent the Olympics going ahead.
Vladimir Markin, spokesman for Russia’s main investigative agency, said in a statement issued on Thursday that Federal Security Service officers had joined the investigation. He said no motive had yet been determined.