The Knoxville Police Department said two teens were arrested for throwing rocks off an overpass and onto I-640 early Wednesday morning.

KPD said officers went to I-640 West at Bruhin Road at around 4:30 a.m. on Tuesday after a tractor-trailer driver reported that an object hit his truck and shattered the windshield. However, officers weren’t able to find any suspects during their investigation.

On Wednesday, KPD said officers went to the same location at around 2:30 a.m. after receiving several calls of objects being dropped from an overpass onto the interstate and striking several tractor-trailers.

According to KPD, TDOT cameras spotted two people, a 16-year-old and a 17-year-old, walking on the railroad overpass over I-640. After being detained on Central Avenue Pike, they both admitted to dropping rocks off the overpass.