At least 13 people were killed when a private charter bus crashed north of Dallas, Texas, Reuters quoted local media as reporting today. An official at the police department in the city of Sherman, north of Dallas, confirmed the accident and death toll but provided no other details. Police were scheduled to have a press conference Friday morning. The bus carrying 55 people crashed into a ravine about 60 miles (96 km) north of Dallas, local media, citing police who were called to the scene at about 12:45 a.m. CDT (0545 GMT) Friday. The bus fell from a bridge onto a creek embankment below, according to media reports. Local TV footage showed the mangled wreckage of the bus. There were conflicting reports about the number of passengers who sustained injuries in the crash. The cause of the crash was not clear, according to reports, although police said a tire on the bus may have blown out.