Pittsburgh, PA : 2 passengers, 1 in wheelchair, hit and killed by bus they had just exited at university campus on Monday, Oct 26, 2015

A man in a wheelchair and someone who was with him were run over and killed by a bus they had just exited at the edge of the University of Pittsburgh campus on Monday.

The Pittsburgh-area transit bus killed them Monday afternoon near the university's basketball arena, the Petersen Events Center, Port Authority of Allegheny County spokesman Adam Brandolph said. There was no indication either victim was a student.

The man in the wheelchair got off the bus and was crossing the street when he was hit by another vehicle and was knocked under the rear wheels of the bus as it pulled away, Brandolph said. The second passenger was run over by the bus while trying to help the man in the wheelchair, he said.

Transit officials said it appeared the victims were together.

Port Authority CEO Ellen McLean said her agency was cooperating with a city police investigation.

"Today's accident is deeply troubling, and our deepest sympathies go out to the families and friends of the two individuals involved in this tragedy," McLean said.

Per Port Authority policy for any major incident, the bus driver was to undergo drug and alcohol testing.

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2 passengers, 1 in wheelchair, hit and killed by bus they had just exited at university campus