Updated at 1:32 p.m. Thursday: Revised to include more information about the incidents.

One person was injured and two vehicles were damaged by rocks hurled onto the George Bush Turnpike in Rowlett over the weekend.

The incidents occurred just before 2:50 p.m. and 6:15 p.m. Saturday, according to Detective Cruz Hernandez, a Rowlett police spokesman. The rocks were thrown from a nearby railroad trestle located about 30 or 40 feet above the tollway.

The victim, who was injured in the first incident, was in the passenger seat of a southbound vehicle when a rock shattered the windshield and struck his chest, right below the chin, Hernandez said. The man told officers he blacked out for a moment from the impact.

Hernandez said the victim was treated by paramedics at the scene and then taken to a hospital, where he was treated and then released.

A second vehicle was hit around the same time, and the rock narrowly missed the driver's head.

In the later incident, a northbound car was hit on its front bumper.

Police said there were multiple rock-throwers but were still working to determine their identities.

Anyone with information about the incident is asked to contact police at 972-412-6220.