A couple is warning drivers to be careful, after they said someone threw a rock at the windshield of their car while they were driving on a highway over the weekend.

“I just clenched the drivers’ wheel and just ducked and didn’t know if it was coming through or not,” Jo LaFrance said, describing the moment a large rock, about the size of a tennis ball, hit the windshield of her car Sunday.

LaFrance was driving on Highway 60 through Enoch Cree First Nation, at about 3 a.m. Sunday when it happened.

Her husband, Steve, was sleeping in the passenger’s seat – and he said the impact of the rock striking the car woke him.

“I thought we hit a deer, and I looked at Jo and she said some kids just threw rocks at us,” Steve LaFrance said.

“The first thing that ran through my head was had it gone through it would have killed her.”

Jo stopped the vehicle, and Steve gave chase – later finding the rock used in the incident by the car.

“You work hard to pay for stuff and you have some kids running around like this laughing,” Mr. LaFrance said. “Maybe not laughing after the scare I gave them.”

RCMP responded, and confirmed to CTV News that two other vehicles had been hit, within 20 minutes.

Police said it was early in the investigation, and asked anyone with information that could help police to call them.

With files from Serena Mah