SEATAC, Wash. -- King County sheriff's deputies found a man shot to death in a car at a SeaTac intersection early Monday morning.

King County Sheriff's Office spokeswoman Sgt. Cheryl McDonald said a man in his 30s was found inside a green sedan near the intersection of International Boulevard and State Route 518, with at least one gunshot to the chest. He was pronounced dead at the scene.

VIDEO: Police Dog, Helicopter Search For Gunman

Police responded to the area after receiving an anonymous call that a person was slumped over the wheel of a car. Officers used a search dog and helicopter in an attempt to track the shooter, but he remains at large. No description was immediately available.

Detectives had blocked the southbound lanes of International Boulevard between South 154th Street and South 160th while they conducted their investigation. Those lanes are now open.