Police arrested one suspect and are searching for another over a shooting near Seattle's Space Needle that killed at least three people and wounded four others, including a toddler Sunday.

Assistant Police Chief Tyrone Davis said shots were heard around 6 p.m. (1 a.m. GMT) and "there were two people who we believe were shooting at each other." Two weapons were recovered.

There is "no outstanding threat to the community," he said.

Seattle Police said two people died at the scene at the Seattle Center and a third died in hospital.

Washington Gov. Bob Ferguson said State Patrol SWAT officers had been deployed to assist local police.