Union County, PA- One person is dead and 44 others are injured after a Greyhound bus collided with a tractor-trailer in central Pennsylvania early this morning.

The Greyhound bus which was carrying 50 passengers, embarked from New York City late Tuesday night headed to Ohio. Just before, 2 a.m., the bus rammed into the rear of a tractor-trailer.

The driver of the tractor-trailer, Akos Gubica told police at the scene that he was traveling westbound on I-80 headed to Ohio when he was struck in the rear by the bus. He also told police that he was driving the speed limit and that he doesn’t know why the bus struck him, according to the Daily Item.

Gubica was not injured.

It is unclear how fast both the vehicles were traveling at the time of the accident.

One woman, who has not been identified, died and 44 others including the driver were taken to local hospitals for treatment.

It took about 20 ambulances to carry the injured to area hospitals.

Geisinger Medical Center said four of the 17 patients who were brought to their facility were in critical condition, with two listed as serious and 11 fair, the Columbus Dispatch. Fourteen of the injured were taken to Evangelical Community Hospital which couldn’t provide their immediate conditions.

Thus far 32 passengers have been treated and released.

Police are still trying to determine the cause of the accident and were forced to close the westbound lanes of Interstate 80.

Greyhound is cooperating with police, but has initiated their own investigation. Greyhound spokeswoman Alexandra Pedrini said the driver has worked for the company for 12 years.

Greyhound dispatched relief buses to take those who were not injured or who were released from hospitals to their destination.

Video footage taken at the scene shows the bus’s front end was badly damaged giving insight into the . It appears as though the engine was pushed into the bus. Pictures of the scene show passengers sitting by the roadside wrapped in blankets. Luggage and bus parts can be seen scattering the highway.

Interstate 80 westbound reopened at 4 p.m. this afternoon after being closed for 14 hours.

It will take investigators weeks to determine the cause. Typically, when accidents involve buses, the National Traffic Safety Board is called to assist with an investigation, but Pennsylvania authorities may be on their own since scores of federal workers are on furlough.

Once the cause of the crash has been determined the victims can seek compensation from the responsible party. But in such early stages of an investigation is difficult to determine exactly who is at fault, whether it is the bus driver or the truck driver or both.

While the truck drive may not be liable for this accident, there are thousands of truck accidents caused by negligent drivers every year. A truck accident attorney works to make certain the victims of truck accidents are able to obtain compensation for their medical care along with their pain and suffering.