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PHILADELPHIA (CBS) — A jackknifed tractor-trailer is causing a traffic mess during the Thursday evening rush-hour commute on I-95 in Philadelphia. The accident happened after 3 p.m. in the southbound lanes of I-95 near Cottman Avenue.

The southbound lanes were closed for around an hour-and-a-half.

Traffic is backed up for miles into Bucks County following the accident.

There is no word if the truck driver was injured.

Stay with CBSPhilly.com for this developing story.