PORTLAND, Ore. (KOIN) — One man was wounded in a shooting near the Broadway Bridge Monday morning and 3 people were later taken into custody although police said they are still looking for the shooter.

The man was shot around 9:45 a.m. on Northwest Naito Parkway under the west end of the bridge. He was taken to a local hospital for treatment of a serious injury.

A woman who asked to not be identified told KOIN 6 News she was coming out of a building when she heard a woman’s voice arguing.

Portland police responded to a reporting shooting near the Broadway Bridge Monday, March 19, 2018. (KOIN)

“Then I heard 2 gunshots and a pause, and then there was 4 more,” she said. “When I turned around I saw the guy grabbing his body and he fell to the ground. And when I walked down here he had a gunshot wound.”

The victims wa at the base of the stairs for the bridge, near where he and his girlfriend live at a homeless camp, the witness told KOIN 6 News.

She said the incident may have been over a dog.

“Some guy came up and was harassing their dog and they asked him to leave the dog alone, and then he went up to the girl and she asked him to leave her alone,” she said. “We heard some arguing and the next thing you know there was gunshots and then he was on the floor.”

It’s not clear at this writing if the 3 people taken into custody are directly related to the shooting incident. Detectives told KOIN 6 News this remains an active investigation.

Anyone with information about this shooting is asked to call the non-emergency line at 503.823.3333.