MOSCOW (AFP) A car packed with explosives blew up in Russias restive North Caucasus Thursday with the country on high alert after an Islamist group claimed the Moscow metro bombings and warned of more strikes. Many of the 39 killed in Mondays suicide bombings on the city metro were to be buried on Thursday and the country has also been shaken by the double suicide strike in the North Caucasus on Wednesday that killed 12. In the latest unrest, two people were killed in the Khasav-urtsky district of the North Caucasus region of Dagestan during the night when their car suspected to have been packed with explosives blew up. According to preliminary information, the explosive materials that were in the car went off accidentally, the Interfax news agency quoted a security source as saying. The Islamist group the Emirate of the Caucasus, which is waging an insurgency to impose an Islamic state based on Sharia law in the North Caucasus, claimed the metro attacks in a video message from its shadowy leader. Doku Umarov, who has been the target of several attempts to kill him by the Russian security forces, said he personally gave the order for the metro attacks. It is a legitimate act of revenge for the continued assassinations of civilians in the Caucasus, he said in the video posted on the kavkazcenter. com website which is frequently used by militants to post messages.