PHILADELPHIA (CBS) -- Police say a fight that began in Philadelphia's FDR Park Wednesday morning turned into a vehicle chase and shooting going the wrong way on Interstate 76.

The shooting investigation closed all westbound lanes of the highway for several hours. The road reopened before 6 a.m.

Investigators claim at least 19 shots were fired across both locations.

It all started around 3 a.m. at FDR Park on Pattison Avenue in South Philadelphia.

There were two vehicles involved in the chase when they ended up going eastbound in the westbound lanes on I-76.

At one point, shots were fired and police say 18 shell casings were found at the scene.

One of the vehicles, a Ford Explorer, was hit about eight times.

A 27-year-old in that vehicle was shot in the neck in the backseat and was paralyzed, and rushed to a hospital in critical condition.

"The tow truck driver was amazed there was no auto accidents, because these vehicles were traveling at a high rate of speed, who were chasing each other, going the wrong way on I-76," Philadelphia Police Chief Inspector Scott Small said. "So this could have been a lot worse."

Police say they do have witnesses in connection with the incident.

A man is in custody.