MAKHACHKALA-A powerful car bomb exploded Monday at a police checkpoint in Russia's Dagestan republic, killing two officers and the car's driver and wounding 19 others, in what appears to have been a suicide attack, investigators said.
The attack was believed to have been organized by Islamic militants who have sworn allegiance to the Islamic State group and carried out by a man who spent time in Syria, said Rasul Temirbekov, spokesman for the Dagestani branch of the federal Investigative Committee.