Updated

A man has been jailed on charges he smashed a patrol car's windshield with a large rock before chasing the cruiser and attacking an Pennsylvania officer.

Police say the motive for the attack Monday afternoon remains unclear.

WPVI-TV reports that 29-year-old suspect Eric Watson told a judge he had been homeless in Coatesville for four years and wanted to return home to Jamaica.

Police say Coatesville Officer Jared Davis was on patrol when Watson threw the rock at the passing cruiser. They say he then tried to hit Davis with the rock outside the car.

Davis wasn't injured, but another officer suffered a broken sternum in the struggle to arrest Watson.

Watson is charged with aggravated assault and other crimes. He doesn't yet have a lawyer listed in court records.

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This story has been corrected to say the suspect tried to hit Davis with a rock outside the vehicle, but the officer was not injured.