Two suspected militants were killed and one was injured in the explosion which took place in Dagestan, news reports said on Thursday, Apr 1.
Interfax and RIA Novosti news agencies report that the blast took place shortly past Wednesday, Mar 31 night.
"According to preliminary information the IED they were carrying in the car self detonated near Toturbykala village in Khasavyurt district," the Caucasus republic's interior ministry was quoted as saying.
On Mar 31, militants struck the same Dagestan with twin suicide attacks in which 12 people were killed. This attack took place in Kizlyar town.
Security has been beefed up in the region following the twin bomb blasts.
Russia has been suffering a slew of suicide attacks. It began on Monday, Mar 29 when twin blasts carried out by female suicide bombers killed 39 people in attacks on two Moscow metro stations.