Reports from Russia say four people have been killed and six injured in a car bomb attack in the country's restive North Caucasus region.
The Ria-Novosti news agency says the explosion occurred outside a cafe in Khasavyurt in Daghestan.
No further details were immediately available.
Russia has been grappling with a growing Islamist insurgency in mainly Muslim republics in the North Caucasus.
The country is also on edge following a suspected suicide bombing at Moscow's largest airport that killed 35 people.
No one has claimed responsibility for the January 24 attack at Domodedovo airport.
Suspicion has fallen, however, on Islamic militants from the North Caucasus, a region that includes Chechnya and Daghestan.
compiled from agency reports