Emergency crews responded to an accident involving a tractor-trailer, two school buses and several cars in Pittsburgh's West End Friday morning.

Cmdr. Scott Schubert from Pittsburgh police said a total of nine cars were involved the accident along Greentree Road.

Two people were taken to Allegheny General Hospital and were initially listed in critical condition. Schubert said they have now been downgraded to serious condition. Schubert said one of those injured was a female bus driver who was ejected from the bus.

The second seriously injured victim was a man who was ejected from his car, Schubert said.

First responders and witnesses said the scene looked like something out of a movie.

"It was like chaos. I looked over and the tractor-trailer was coming down the uphill lane. It had to be moving 60 to 70 mph, just running into so many cars," said witness Tony Lutz.

Lutz and Brendan Garvey said what they witnessed was a nightmare.

"I called 911. I didn't know what to even say to them it was that bad," Garvey said.

 Garvey and Lutz, who work nearby, said they immediately jumped into action and tried helping the injured.

"We found a guy laying in the middle of the street under a snow plow. It was chaos. It was like somebody dropped a bomb in the middle of the West End," Lutz said. "We sat with him and prayed with him."

The driver of the bus who was ejected landed in Linda Witherspoon's yard.

"She flew from the school bus right in front of my house. I was trying to help her out. She said, 'Am I going to die?' I told her that she was going to be OK," Witherspoon said.

Witherspoon said she was getting her grandchildren ready for school when she saw the tractor-trailer barreling toward her. Not only did she witness the crash but her home was also hit.

"I seen it coming. It was going 100 mph. The driver was trying but he couldn't do nothing," said Witherspoon.

Pittsburgh Public Schools spokeswoman Ebony Pugh said one of the buses involved had just dropped of students at Brashear High School and there were no students on board the bus at the time of the accident.

Bill Englert, West Allegheny School District superintendent, told Channel 11 News that the other bus involved was from his district. Englert said the bus was rear-ended by another bus in the accident.

Englert said two students were on the bus at the time. One student was not hurt and another was taken to Children's Hospital of Pittsburgh as a precaution. The driver of the bus was not hurt.

According to police the tractor-trailer was traveling down Greentree Road in the opposite lane and was hitting cars on both the right and left.

Schubert said when he got to the scene it "looked like a nightmare" and  it's a miracle that no one was killed.

Police said the driver of the tractor-trailer speaks broken English and may be from Cuba. The truck appears to be from ABC Freight out of Hollywood, Fla.

Schubert said the driver of the tractor trailer was taken to police headquarters on the North Side to be interviewed.