A bus carrying the North Central Texas College softball team through Oklahoma was struck by a tractor-trailer late Friday night, killing four and injuring fifteen. The tractor-trailer had allegedly crossed over the center median of highway I-35.

Oklahoma Highway Patrol Captain Ronnie Hampton spoke with the Oklahoman regarding the accident:

"What we do know is that the semi (truck) was headed north on I-35 when he departed the roadway and entered the southbound lanes," he said.

"When it impacted the bus, it just kept going and went off the side of road. ... We knew we had a two-vehicle accident by what we saw at the scene. ... But it took about an hour before we found the semi," he said.

The team had been returning back to Texas after a scrimmage with Southern Nazarene University. One witness described the destroyed bus as being "opened up like a sardine can."

Hampton told the Oklahoman that both drivers will be tested for drugs and alcohol, saying that the accident "is being investigated like a homicide." North Central Texas College is expected to hold a press conference this morning regarding the accident.

[Image via AP/the Oklahoman]