Moscow police search for bombing suspects MOSCOW, May 5 (UPI) -- Russian authorities said a car carrying suspects in Thursday bombings in the Russian North Caucasus region has been spotted on surveillance cameras near Moscow. The two bomb attacks in the North Caucasus republic of Dagestan killed 13 people and injured more than 100, RIA Novosti said. Investigators fear there could be attacks during the May holidays in Moscow, when there will be several large political rallies, including President-elect Vladimir Putin's inauguration Monday and the Victory Day parade Wednesday, RIA Novosti said. The car carrying suspects in Thursday bombings, a VAZ 21140 with Dagestan-region license plates, was spotted by surveillance cameras April 28 on Don Highway south of Moscow and on the Dmitrovskoye Highway north of the capital, a law enforcement source told LifeNews. The source said the suspects in the Dagestan bombings were believed to be part of the Makhachkala gang headed by Gusein Mamayev. Dagestan authorities said they had determined Mamayev and three others were behind Thursday's attacks. In the attacks, a Mitsubishi car packed with explosives was blown up near a police station in Makhachkala, the capital city of the republic of Dagestan, and another car bomb exploded as law enforcement officers arrived to investigate the first attack.