At least 15 people died and 20 were injured in a head-on collision between a truck and a bus in southeastern Iran, the official Islamic Republic News Agency reported Wednesday. Three children were among 13 people who died instantly in Tuesday's accident. Two other people died at the hospital, the agency reported. Police blamed the driver of the truck for the accident, saying he tried to overtake a vehicle and slammed into the oncoming bus on Zahedan-Zabol road, 1,600 kilometers (995 miles) southeast of the capital Tehran, it said. The injured were hospitalized and one of them was in serious condition, according to the agency.