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WEST END (KDKA) — Three people wound up in the hospital Saturday after a 30-foot RV lost control and barreled through a busy intersection.

Witnesses told KDKA-TV it seemed that the driver of the RV lost his ability to brake and started frantically honking the horn as he blew through the intersection, clipping several cars.

“We were sitting here at the stop sign and we were the next ones to go and heard this horn,” said Mike Westgard, driver. “And then it was boom and smash and crash and it hit that silver car and went on into the building there.”

(Photo Credit: KDKA Photojournalist Fletcher Rumbaugh)

The RV crashed straight through the cinderblock wall of a building at the intersection of Greentree Road and Woodville Avenue. It clipped two cars and destroyed the rear end of another.

“My dad and I both hopped out of the car, bolted over there and heard some yelling there was leaking gas and everything,” said John Westgard, witness.

Witnesses tell KDKA-TV they watched as the RV sped down the hillside.

“It was really loud real loud like almost like a bomb,” said Lorrae Bell, witness.

(Photo Credit: Meghan Schiller/KDKA)

“Thank God no one was killed it could have been much worse,” said Denise Serbin, driver. “But the other 2 people in the camper and the other man in the car were all taken to the hospital.”

The driver of the gray car wound up at Mercy Hospital in stable condition. The two inside the RV were taken to Allegheny General Hospital originally in serious condition, but they’re now listed in stable condition.

“He was just flying like mid-air once he hit the stop sign he just flew,” said Bell. “I didn’t think he was going to make it I thought he was going to flip.”

(Photo Credit: Pittsburgh Department of Public Safety)

First responders heard the cries of a cat and found a cat in its cage in the rubble. They also located a dog. We’re told those animals were brought to the Humane Society for the evening.

The cause of the crash is still under investigation but witnesses on scene said it appeared to be a mechanical failure.