MOSCOW Ė A prosecutorís assistant in the North Caucasus was killed Tuesday when unknown assailants detonated a bomb under his car, Russian authorities said.
The blast occurred just after Ruslan Gasanov got into the vehicle outside his home in the Republic of Dagestan, a regional spokesman for Russiaís Investigative Committee said.
Gasanov, who was an aide to the district prosecutor in Buinaksk, a town 40 kilometers (25 miles) from Dagestanís capital, Makhachkala, died instantly, the spokesman told the Interfax news agency.
The suicide bomber who killed 17 people at the train station in the Russian city of Volgograd last Sunday was a resident of Buinaksk.
Piotr Pechionkin, an ethnic Slav, settled in Buinaksk in 2012 and adopted the Islamic name Ansar ar-Rusi, according to Russian authorities investigating the pair of attacks in Volgograd that claimed more than 30 lives in less than 24 hours.
Investigators suspect Pechionkin linked up with one of the Islamic militant groups operating in the conflictive North Caucasus region as a legacy of Russiaís wars with the would-be independent Republic of Chechnya.
Russian officials fear an increase in terrorist and guerrilla attacks as the 2014 Winter Olympic Games in the Black Sea resort of Sochi approach.
The games begin Feb. 7.