( CNN) Two females were found unresponsive in a car along with the likely culprit — four coolers of dry ice — Friday morning in Pierce County, Washington, CNN affiliate KOMO reports .

The owner of the car, an ice cream salesman, called 911 when he found his wife and his mother on the side of the road blocks from his home, according to the station. His 77 -year-old mother is reported to have died of suffocation, and his wife to have been in critical condition.

“His mom and his wife get in the vehicle to give his mother a ride home, ” Detective Ed Troyer, a spokesman for Pierce County Sheriff’s Department, told KOMO. “The fumes escaped from the coolers.”

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