Police in Russia's southern region of Dagestan say a driver stopped by traffic police has detonated explosives in his car, killing a passer-by and injuring several police. Spokesman Mark Tolchinsky says the blast struck early Monday at a traffic checkpoint on the outskirts of Dagestan's capital city, Makhachkala. Tolchinsky told media that the police post was partly destroyed in the blast. Dagestan's Interior Minister Ali Magomedov says in stopping the car, the traffic police managed to avert a large-scale terrorist attack in Makhachkala.