PHILADELPHIA (CBS) — An accident involving a tractor-trailer is causing big delays on I-95 through Northeast Philadelphia.

It happened early Saturday morning in the northbound direction between the Cottman Avenue and Academy Road exits.

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The jackknifed tractor-trailer is blocking the shoulder, right and center lanes. Only traffic in the left lane is squeezing by.

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The crash is causing traffic to back up several miles past the Betsy Ross Bridge.

Motorists are warned to expect delays.

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There is no word on any injuries.