PHILADELPHIA (CBS) — Six people were injured in a crash that involved a school bus on the Vine Street Expressway Monday.

The multi-vehicle crash happened at about 11 a.m. in the westbound lanes of Interstate 676 near 22nd Street.

Chopper 3 HD was over the scene where it showed a yellow school bus, a Megabus tour bus and a minivan involved in the crash. There were several other cars stopped near the scene of the accident.

There were reports of at least two people injured, although it was not immediately known which vehicles the victims were in at the time of the crash.

As a result of the crash and the investigation, traffic in the area is backed up.

The crash remains under investigation.

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