arrested a man accused of assaulting a gay couple in downtown Portland last week but said they are still looking for a second suspect who showed a knife during the fight and helped damage an SUV.

Paul Anthony Martinson, 39, faces charges of assault, intimidation and criminal mischief in connection with the Wednesday incident, said Sgt. Pete Simpson, a police spokesman.

The couple told police they had just parked at

and were holding hands as they walked toward the Silverado Bar and Nightclub about 11:20 p.m., Simpson said.

Two men approached the couple as they walked, Simpson said. One allegedly made anti-gay slurs, sparking a verbal argument that escalated into a physical fight between one of the suspects and one of the victims, a 22-year-old man.

As the two fought, the second suspect showed a knife and continued to use anti-gay slurs before kicking the 22-year-old, Simpson said. The victim managed to fight the two suspects off and ran into the bar to call for help.

Silverado security watched as the two suspects began smashing the windows of the SUV the couple had arrived in, Simpson said. They also slashed its tires and seats before running away.

Security followed one of the suspects, later identified as Martinson, to Waterfront Park, where he was arrested by Portland police at

. He was booked in the Multnomah County Jail.

Police are still looking for the second suspect, Simpson said. He is described as a man in his 20s or 30s, about 5-foot-10, 160 pounds and with short hair.

Investigators ask anyone with information about the incident to call Detective Paul Dolbey at 503-823-0451 or send him an

.

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