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Vienna Township — Michigan authorities have reopened a portion of Interstate 75 after gathering more evidence, two days after a rock thrown from a highway overpass smashed a windshield and killed a man.

TV stations reported Friday that teenagers have been taken into custody in Genesee County, although it wasn’t immediately clear how many. The sheriff’s office declined comment.

Authorities say 32-year-old Kenneth White of Mount Morris was riding in the car Wednesday night in Vienna Township, about 80 miles north of Detroit, when he was hit. The car was traveling southbound on Interstate 75.

Four other vehicles were struck with large rocks or concrete chunks. Investigators say they believe rocks may have been taken from another location and thrown off the overpass.

Crime Stoppers of Flint and Genesee County is encouraging anyone with information to come forward. A $2,500 reward is being offered.

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