Two people were killed in Russia's North Caucasus region today after a blast ripped through their car. The vehicle was believed to have been carrying explosives. Interfax news agency quoted police as saying the car blew up near a village in western Dagestan and a third person was in hospital with serious injuries. A Police spokesman said preliminary information indicate that an explosive device transported in the car spontaneously went off. Suicide bombers killed at least 12 people in the Dagestani town of Kizlyar yesterday.Meanwhile, Moscow is preparing to hold funerals today for most of the 39 people killed in Monday's double suicide bombings on the city's Metro system. Two of the victims of the attacks were buried outside the city yesterday.Chechen rebel leader Doku Umarov has said his group was behind the attacks. In a video message posted on a Chechen rebel website, he said he had personally ordered the operation. He said they were carried out to avenge the killings of poor Chechens by Russian security forces in February and warned Russia to prepare for more. Russian investigators have said they believe two female suicide bombers were linked to militants in the North Caucasus.In a separate development, at least 12 people, including a top local police official, were killed by two suicide bombings in Russia's North Caucasus republic of Dagestan yesterday. So far no-one has claimed responsibility for the Dagestan blasts.