An explosion at a petrol station in Russia’s southern region of Dagestan has killed at least 13 people.

The death toll in an attack by Islamic militants in the Dagestan region of southern Russia has risen to 21 after an injured police officer died in hospital, officials said on Tuesday.

More than 15 police officers and several civilians, including an Orthodox priest, have been killed by armed militants in Russia’s southern republic of Dagestan, its governor Sergei Melikov said in a video statement.