There has been a second incident involving youths throwing rocks at cars on Maley Drive in Sudbury, police say.
The first incident happened around 1:30 p.m. Aug. 28 when drivers reported seeing a group of young people throwing rocks at the roadway from the rock cut.

One of the rocks struck a motorcycle, causing a crash and sending the driver to hospital with serious injuries.
The second incident happened in the same area west of the Barry Downe Road roundabout just before 2:10 p.m. Sept. 4, but on the opposite side of the road.
"Information provided was that a community member was driving eastbound on Maley Drive … when a large rock struck the windshield of the vehicle causing substantial damage," Sudbury police said in a news release Thursday morning.
"The community member looked back to see where the rock came from and saw two youths on the hill in the same area (opposite side of the road) as the collision that occurred on Aug. 28 involving a motorcycle."
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The youths were standing on the grassy hill south of the eastbound lanes, police spokesperson Kaitlyn Dunn told CTVNewsNorthernOntario.ca in an email.
They are believed to be responsible for throwing the rock that hit the car's windshield.
The driver couldn't get a good look at the suspects, so no descriptions are available.
One of the suspects from the first incident is described as a male with shoulder-length red hair and freckles.
Investigators are asking anyone with a dash camera driving in the area at the time of the incident to contact them.
Anyone with information about either of the incidents is asked to call the dedicated tip line for this incident at 705-675-9171 ext. 2320.
With files from CTV Sudbury reporter Lyndsay Aelick.