Police have released a 51-year-old man who was arrested on Sunday after a 10-hour manhunt in Portland.

Michael Ervin Grubbe was released from Multnomah County jail about 1 a.m. Monday, said Lt. Chad Gaidos, the sheriff's office spokesman. He was released on his own recognizance and without bail after spending less than three hours behind bars.

Grubbe was arrested Sunday following a lockdown of the Laurelhurst neighborhood amid a massive police search for an armed man who was spotted early Sunday with a gun walking in the area.

Portland police said Monday in a news release that Grubbe was indeed the man they were seeking. But they did not find a gun. Rather, they recovered what they called a "realistic-looking replica firearm" near Northeast Couch Street and Laurelhurst Place.

The release said it was a Umarex 40 XP CO2 BB gun, with a metal slide and a 19-round magazine. Detectives also obtained video of the suspect walking in the neighborhood with what appears to be a black handgun, the release said.

During the manhunt, shots were fired and the suspect fled, police said.

Officers fired twice on separate occasions. Residents reported hearing at least nine shots.

The manhunt came two days after a knife attack on a MAX train that left two Good Samaritans dead and a third injured.

Grubbe was arrested at Northeast 35th Avenue and Sandy Boulevard.

-- Lynne Terry