Police say a 17-year-old boy was riding on a bike, with an 8-year-old boy sitting on the handlebars.
The bike allegedly darted in front of a New Jersey Transit bus and was struck, trapping the 8-year-old underneath.
He was then trapped under the bus until he could be freed by rescuers.
That child is in extremely critical condition at Cooper Trauma.
Police say the 17-year-old managed to get up after being hit, then fled the scene. Police are now looking for that teen.
Investigators have not released his name.
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