VIENNA TOWNSHIP (WWJ/AP) – It appears several teens are being questioned in connection with the rock throwing incident that left a Flint-area man dead.

Unconfirmed reports say the teens are in police custody. It’s unclear if police think the teens are responsible or if they just have information about the incident.

A $2,500 cash reward is being offered about the death of 32-year-old Kenneth White, who was killed Wednesday night when a rock crashed through the windshield and struck him in the face. The car was traveling southbound on I-75 near the Dodge Road overpass in Genesee County’s Vienna Township, about 80 miles north of Detroit.

Four other vehicles were struck with large rocks or concrete chunks. Several other vehicles were damaged after they hit rock debris in the roadway, although no additional injuries were reported.

Investigators believe the rocks may have been taken from another location and thrown off the overpass. The sheriff’s office says a group of people may be responsible.

Crime Stoppers of Flint and Genesee County is encouraging anyone with information to come forward. Billboards are going up along the freeway to draw attention to the case.

Anyone with information is asked to call the Genesee County Sheriff’s Office at 810-257-3422. You can also submit a tip anonymously to Crime Stoppers at 1-800-422-JAIL or online at P3tips.com.

© Copyright 2017 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.