North Carolina police say that they have received several reports that someone has been throwing rocks off of an I-85 overpass onto semi trucks.

The rock throwing incidents began on Sunday in Vance County between Henderson and Middleburg. According to reports, at least four truck drivers have been targeted by the rock thrower on I-85.

So far, no injuries have been reported, but the incidents have caused serious and costly damage to the trucks that were targeted.

The Vance County Sheriff’s Office is investigating the incident.

Until the suspect is caught, drivers are urged to use caution in the area, especially after dark.