PHILADELPHIA (CBS) — Police say a pedestrian was struck and killed overnight while walking along I-95 in Bucks County.

It happened around 3 a.m. Saturday in the southbound lanes near exit 37 at Cornwell Heights.

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All southbound lanes were closed between Street Road and Woodhaven Road for about five hours as a result of the accident.

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It wasn’t immediately clear why the pedestrian was walking on the highway.

There were no reports of any injuries.

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The cause of the accident is under investigation.