Cowlitz County, Wa- Firefighters from Cowlitz 2 Fire & Rescue responded to a motor vehicle accident involving two passenger cars and a semi truck on Interstate 5 Northbound near exit 36 Saturday morning at 5:36. Three patients were transported, by two ambulances, to Peace Health St. John’s Medical Center for sustained injuries from the wreck. The accident caused heavy damage to one Honda Accord, moderate damage to another passenger car, and damage to the rear axle of the semi truck’s trailer. The two inside lanes were closed while Washington State Patrol conducted their investigation of the crash causing traffic to back up to Kalama for most of the morning. A fire engine, two medic units, and a Chief Officer responded from Cowlitz 2 Fire & Rescue. Cowlitz County Sheriff deputies and Kelso Police also responded to the incident. The identities and injuries of the patients, and cause of the accident have not been released by authorities.