MEADVILLE, Pa. —  A 1,500-pound wrecking ball broke loose from a crane cable and raced downhill, smashing into several cars and injuring three people before coming to rest in the trunk of a car at an intersection Monday.

The wrecking ball, about 3 feet across, was being used to demolish part of a library at Allegheny College when the cable snapped, police said. The crane operator tried to stop it, but it rolled nearly three-quarters of a mile downhill, damaging more than a dozen vehicles as it bounced from curb to curb, police said.

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