A commuter train outside Philadelphia smashed into a parked train car, hurting 42 passengers early Tuesday, but an official said none of the injuries were life-threatening.

The collision happened just after midnight at the 69th Street Terminal Center in Upper Darby, Pa., about 10 miles west of Philadelphia, Southeastern Pennsylvania Transportation Authority spokeswoman Heather Redfern told Reuters.

The Norristown High Speed Line train was pulling into the station when it hit a second, unoccupied train car. The operator was among those injured, she said.

"The injuries appeared to be non-life threatening for all passengers and the operator," Redfern said. "It's all under investigation at this point."

The Associated Press quotes Upper Darby Mayor Nicholas Micozzie as saying that four of those hurt were in critical condition.

"There was blood everywhere," one witness, identified only as Ronnie, told Philadelphia's CBS affiliate. "There was this driver all banged up and there was this one girl bleeding out of her face pretty bad."

The National Transportation Safety Board tweeted that it was sending a team to investigate the SEPTA crash.

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