At least four people were killed and six others wounded when a blast ripped through a cafe in Russia's volatile southern republic of Dagestan, RIA Novosti news agency reported early Thursday.
A car bomb exploded in front of a cafe in the city of Khasavyurt late Wednesday, local police said.
"Our hospital received three dead and seven injured. One of the injured later died during a surgery," RIA quoted a spokesman for a local hospital as saying.
It was the second car bombing in Khasavyurt in the past two weeks. On Jan. 14, a similiar attack killed four and wounded five in the city.
Violence is common for Russia's North Caucasus republics of Chechnya, Dagestan and Ingushetia with militants frequently assaulting police officers and authorities.
Moscow has vowed to bring stability to the region by improving social services and raising pensions and salaries.