A semi truck driver was among the victims in an unnerving series of rock throwing incidents in Seattle.

The latest Seattle rock throwing incident began around 3 a.m. on Tuesday when a semi truck traveling south on I-5 was hit by a rock thrown from an overpass near the Columbian Way interchange. The rock shattered the truck’s windshield.

During the morning rush hour on Tuesday, a second vehicle traveling south on I-5 at the James Street overpass was hit by a rock, shattering the windshield.

A third incident occurred around 10:30 a.m. on Tuesday, shattering the windshield of a vehicle on I-5 near the Dearborn Exit.

No injuries were reported.

There is no description of the suspect or suspects available at this time.

So far this year, there have been more than 70 rock throwing incidents in Seattle, with many occurring along the I-5 and I-90 corridor.

Washington State Police reported that six people were injured in the last 2 ½ weeks from rocks thrown at vehicles.

Two people were arrested on Sunday and Monday in connection with suspected rock-throwing. Police later used surveillance video to determine that one of the people arrested was not connected to a rock throwing incident and released that person from jail. The second person was placed on involuntary commitment.

Washington State Police are working with the Seattle Police Department to investigate the incidents.

Troopers released a statement on June 18 asking for public help in putting a stop to rock throwing.

Chief John R. Batiste said, “Throwing rocks and debris at moving vehicles is not just against the law, it can be deadly dangerous. We are asking for the public’s help. Somebody out there knows something that can help us stop this before we suffer a loss. Please call 911 if you have any information about who is doing this. Highway safety is everybody’s responsibility. Working together, we can keep our Washington highways safe.”

The video below shows a person throwing rocks at vehicles on I-90 in Seattle.