Portland police are looking for three men dressed all in white suspected in a shooting that injured three at the downtown Willamette River waterfront.

Police investigate after a shooting at the Portland waterfront that injured three.

Police say shots were fired into a large crowd of people waiting in line for a party on the Portland Spirit, a boat contracted for private events, just before 11 p.m.

Flyers scattered around the area of the shooting describe a "Red & White" party to be held on the boat Saturday night. It was to depart on a cruise just after the time of the shooting.

Officers were combing downtown looking for three men dressed in white hats, shirts and shorts who may have been the shooters.

The shooting is believed to be gang-related, police said. Many of the people in line for the party were identified as gang affiliates by members of the police bureau’s gang unit.

Three injured men were taken to Portland hospitals. Two have traumatic injuries and a third has serious injuries, but none of the injuries are believed to be life-threatening.

A portion of the waterfront near Salmon Springs and the Portland Spirit was closed while police investigated late Saturday.

-- Elliot Njus