Two districts in the Stavropol region were placed on high alert after the bodies were found in four cars, one of them apparently booby-trapped on Wednesday, a news agency quoted the FSB security service as saying.
An unidentified explosive device was also found near one of the vehicles, said a spokesman for Russia's Federal Security Service (FSB) in Stavropol. No other details were immediately available.
The Investigative Committee, which probes major criminal cases in Russia, opened investigations into murder, arms trafficking and attempts on the lives of law enforcement officials.

The Stavropol region borders the Krasnodar region where the Black Sea resort of Sochi is located.

Russia particularly fears attacks by Islamist militants from the North Caucasus during the Sochi games, after two suicide bombings at a rail station and in a trolleybus last December in the southern city of Volgograd.

Security measures around Sochi include special permits for cars to enter the city or access Olympic venues, as well as drones monitoring the region and patrols by army troops.


Latest News from World News Desk