PHILADELPHIA (CBS) — Center City traffic is tied up during Friday evening rush hour following a tractor trailer accident.

The accident happened near the ramp to the Ben Franklin Bridge on 8th and Vine Streets where a tractor trailer overturned shortly after 1 p.m.

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It’s unclear exactly what caused the accident.

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One person was taken to the hospital. There is no word on their condition.

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The trailer has been removed, but traffic is still being affected in the area.