A Minnesota man was arrested Wednesday for allegedly fleeing the scene after a boulder fell from the dump truck he was driving, killing two women in a car nearby.

According to the Pioneer Press, Joseph Paul Czeck, 33, was driving the commercial truck south Monday afternoon when a boulder he was hauling—three feet wide and 800 pounds—broke free, tumbled, and struck a Toyota Avalon traveling north on Rich Valley Road.

The Toyota’s driver, Karen Christiansen, 67, and her daughter, Jena, 32, were both pronounced dead at the scene. The Hennepin County medical examiner’s office said they each died from blunt force trauma to the head.

Czeck allegedly fled the scene, but police told reporters that construction workers were able to identify the truck as belonging to Czeck Services. The workers reportedly told investigators that they saw the truck carrying boulders on Monday. Security cameras at a local business also caught the truck leaving the scene of the accident with several boulders in tow, the newspaper reports.

By Wednesday, Czeck was booked into jail on criminal vehicular homicide charges. Reports indicate that formal charges are pending. Rosemount Police Chief Mitchell Scott said Czeck didn’t provide a statement upon his arrest but requested an attorney.

Scott said that, as of Thursday, Czeck remains jailed and still refuses to speak with police. He’s scheduled to appear in court on Friday.

“It’s just tremendously sad for the family,” Scott said, according to the Star Tribune. “This is something that could have been prevented.”

[Featured Image: Joseph Paul Czeck/Dakota County Jail; Karen Christiansen, Jena Christiansen/Instagram]