SALT LAKE CITY — A woman was critically injured Sunday morning when the car she was riding in was hit by a truck.

The woman was stopped at 400 West in a midsize car waiting to head west on North Temple when the car was struck around 10:45 a.m., Salt Lake City Police Lt. Carl Merino said. The female passenger and male driver were hit from behind by a westbound truck.

Merino said it is not known how fast the truck was going at the time of the crash, but it is believed to be higher than the speed limit. The truck continued on and struck a second, unoccupied car that was parked on the side of the road.

The male driver and female passenger of the car that was rear-ended were both injured and taken to the hospital for treatment. The woman's injuries were classified as critical while the man's were less serious.

The driver of the truck was uninjured. It is believed he has a medical condition that contributed to the crash, Merino said. Salt Lake City Police Lt. Scott White said the man may have had a seizure.

The incident remains under investigation.

Emiley Morgan, Twitter: DNewsCrimeTeam