Eight people were shot at a a low-rider car show south of Seattle after a fight on Saturday afternoon, police said.
Police were searching for several people believed involved in the shooting, NBC station KING 5 reported.
Hundreds of people were gathered for the car show when a fight broke out and gunfire followed.
Seven victims were taken to hospitals. One person declined treatment. The extent of the victims' injuries was not immediately released but were said to not be life threatening.
"I saw a lot of people running everywhere, running across the street, then the cops showed up," Trish Harvey, who works at a dive shop, told ABC station KOMO. She said she heard about 10 shots.
She described the event as a "very peaceful celebration," KOMO said.
The incident took place about 17 miles south of downtown Seattle.