The California Highway Patrol has created a task force to investigate why dozens of vehicles driving along Highway 101 in Monterey County, California have been hit by projectiles since February.

CBS Local reports that no less than five vehicles were struck with projectiles within a six-minute period on Saturday night. The previous night, four other cars were struck, while on Thursday, two were hit. Since February, there have been a total of 61 attacks along the same stretch of highway. All five of the attacks on Saturday night saw the driver’s side window or windshield getting hit.

According to California Highway Patrol Capt. Kyle Foster, authorities are investigating all of the incidents and says that anyone struck by a projectile while driving on Highway 101 should immediately stop and dial 911 so officers can be sent on the scene as soon as possible.

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“If you drive through the area, keep your windows up, report anything unusual,” Foster added.

The threat of being struck has become such a serious concern for some commuters that many are considering taking different routes to avoid Highway 101.

“Going 70-80 miles per hour, it could cause a big accident, so it’s definitely concerning,” Jorge Mora, who often drives along the 101, said. “If I have the family with me, I’d probably reroute somewhere, even if it might take me a little longer, but safer, I’d probably definitely do that.”

The California Highway Patrol hasn’t revealed what types of objects are being used in the attacks, but say they are roughly the size of a large marble. It remains to be seen if authorities can find out who’s responsible for these potentially very dangerous attacks.