PHILADELPHIA (CBS) – Twelve people were taken to the hospital after a bus crash on Interstate 95 northbound Thursday afternoon.

The accident happened at about 2:30 p.m. near the Columbus Boulevard/Washington Avenue exit when a tractor trailer clipped the rear of a bus carrying adults with special needs.

Twelve of the passengers were taken to Hahnemann University Hospital. Nine were treated and released while three others remain hospitalized.

The accident remains under investigation.

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