SOFIA, Bulgaria (AP) — A bus carrying tourists back to North Macedonia crashed and caught fire in western Bulgaria early Tuesday, killing at least 45 people, including a dozen children, authorities said. DNA tests were being carried out to identify the victims. The bus apparently ripped through a guardrail on a highway, though authorities said the cause was still under investigation. Photos taken shortly after the crash showed the vehicle engulfed in flames as plumes of thick, black smoke rose. Daylight revealed a burned-out shell with all of its windows blown out, sitting in the median. A portion of the guardrail was lying in the road. Seven survivors were hospitalized after the crash, which took place as a group of buses was returning from a trip to Turkey. Twelve children were among the dead, according to the North Macedonia chief prosecutor, Ljubomir Joveski. Bulgarian Interior Minister Boyko Rashkov told reporters at the crash site that he had “never in my life seen something more horrifying” and that the identification process would take time.