Russia plagued with yet more security concerns

The Muslims in the Caucasus region are moving up their ante.  Unexplained killings, and the people killed kept in cars with their bodies booby-trapped to entrap authorities approaching the cars. 

From AP via YahooNews:
6 men found dead in 4 cars, some rigged with explosives, near volatile Caucasus. 

A series of unexplained killings in southern Russia involving booby-trapped bombs has further heightened security fears ahead of next month's Winter Olympics in Sochi.
Investigators were scrambling Thursday to determine who had killed six men whose bodies were found the day before in four cars abandoned in an area just north of the volatile Caucasus Mountains region, where an Islamic insurgency is simmering.
Explosive devices had been placed near three of the cars, although only one of the bombs went off and no one was hurt. The victims had been shot, according to investigators.
Vladimir Markin, the spokesman for Russia's main investigative agency, said in a statement that no motive had yet been found for Wednesday's killings on the outskirts of Pyatigorsk, which is the centre of an administrative district created in 2010 to co-ordinate efforts to combat the insurgency. In late December, a car bomb exploded outside the traffic police offices there, killing three people......