Federal investigators headed to California Friday to try to determine why a FedEx truck crossed a highway median and slammed into an oncoming bus carrying high school students in an explosive crash that left 10 people dead, AP reported. Eric M. Weiss, a spokesman for the National Transportation Safety Board, said a multi-disciplinary team of highway crash experts left on a flight Friday morning for the crash scene. "Every piece of paper associated with this will be looked at," said Weiss. The crash happened a little after 5:30 p.m. Thursday on the interstate near Orland, a small city about 100 miles (160 kilometers) north of Sacramento. Both the bus and truck driver were among those killed in the fiery crash, authorities said. The 44 teenagers aboard, nearly half from the Los Angeles school district, were participating in a program that invites prospective low-income or first-generation college students to visit Humboldt State University in far Northern California. Many of those on the bus escaped through a window that someone had kicked open running for their lives to the other side of the highway before hearing an explosion and seeing the bus burst into flame, Clavijo said. Two more explosions soon followed, he said, and he and other survivors looked on knowing others were still trapped in an inferno. Massive flames could be seen devouring both vehicles just after the crash, and clouds of smoke billowed into the sky until firefighters doused the fire, leaving behind scorched black hulks of metal. Bodies were draped in blankets inside the burned-out bus. -- SPA 19:51 LOCAL TIME 16:51 GMT تغريد