Update 10:47 p.m

A Southeast Portland man who allegedly tossed an explosive under an occupied motorhome Wednesday said he did so because he was tired of homeless people, according to police and court records.

Jeremy Patrick Kidwell, 46, was arraigned Thursday on three felony charges: first-degree attempted arson and unlawful manufacture and possession of a destructive device. He was released Thursday from Multnomah County's Inverness Jail.

Police responded to 160th Avenue and Division Street around 5 a.m. and spoke with two men, according to a probable cause affidavit filed Thursday in Multnomah County Circuit Court. One of them said the motorhome is his and that the explosive didn't detonate.

He told police he tracked down the man who threw the explosive, later identified as Kidwell. He said Kidwell apologized repeatedly, called the explosive "harmless" and said "it just had black powder" inside, according to the affidavit. An arson investigator said the explosive could have damaged the motorhome if it had detonated, the affidavit states.

The man from the motorhome retrieved the explosive and turned it over to an officer. The device was made of three-quarter-inch PVC pipe, was about 4 to 5 inches long, and had a fuse attached.

An officer who was in the area for an unrelated reason arrested Kidwell about 13 hours later, Portland police said in a news release.

An arson investigator who searched Kidwell's nearby home recovered a pipe bomb and hobby fuse, according to the affidavit. The investigator also found ammunition powders, literature about booby-traps and munition, and some PVC pipe "consistent in diameter with the devices found," the affidavit states.

-- Jim Ryan

jryan@oregonian.com

503-221-8005; @Jimryan015

Update adds information about Jeremy Patrick Kidwell being released on bail from Multnomah County's Inverness Jail.