PHILADELPHIA (CBS) — A serious accident involving numerous vehicles shut down a stretch of the Pennsylvania Turnpike for several hours Saturday in Chester County.

It happened around 10 a.m. Saturday in the eastbound lanes approaching Downingtown.

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Drivers at the scene of the crash told the KYW Traffic Center it appeared that more than 20 vehicles were involved.

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All eastbound lanes were blocked for more than four hours as a result of the pile-up.

Officials said at least nine people were taken to Paoli Hospital, where they were treated and released.

There was no other word on injuries.

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The accident happened just two hours after another crash involving at least 20 vehicles brought all traffic to a halt along the Schuylkill Expressway (I-76) in Montgomery County.