A car exploded Tuesday in the troubled southern Russian region of Dagestan, killing two people in what investigators believe was a botched attempt to kill a local prosecutor. The blast occurred in the regional capital, Makhachkala, at around 6 a.m (0200 GMT), killing one of the occupants instantly, an unidentified official at the regional branch of the Interior Ministry said. The second was hospitalized in a critical condition and died shortly afterward from his injuries, Health Ministry spokesman Abdul Musayev said. Russian television pictures showed the charred ruins of the car. The explosion had a force equivalent to half a kilogram (1.1 pound) of TNT, according to the Interior Ministry official.