By Jim Melwert

PHILADELPHIA (CBS) — Police are looking for a hit-and-run driver who they say struck a motorcycle and two other vehicles in West Philadelphia, injuring four people, including a young boy.

The collision took place at 6:30 p.m. Monday at 52nd and West Thompson Streets.

Police say the driver of a black Cadillac made an illegal u-turn, hit a motorcycle, and two other vehicles, and then drove away without stopping.

A 35-year-old man on the motorcycle was taken to the Hospital of the University of Pennsylvania in critical condition. Two other men in their 30s and a 10-year-old boy were also taken to the hospital. Their condition was not immediately known.

The driver of the Cadillac remains at large. Police say the vehicle is believed to have very noticeable front-end damage.

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