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Officer Daniel Chastain of the Portland Police Bureau was "on call" when he was involved in a crash in Clackamas County on April 25, 2016. He was driving a City of Portland vehicle, police said.

(The Oregonian/OregonLive/file)

Update: Motorist stunned, shaken after surviving crash with allegedly drunken Portland cop

An off-duty Portland police officer was arrested Monday on an accusation of drunken driving, police said.

Police said Officer Daniel Chastain was "on call" and driving a city-owned car when he was involved in a crash in Clackamas County. Alcohol was a factor in the crash, Portland police said.

Chastain is facing accusations of driving under the influence of intoxicants, reckless driving, reckless endangerment and first-degree criminal mischief, police said.

The Clackamas County Sheriff's Office said callers reported Chastain was driving "at a high rate of speed," hit a pickup truck and rolled over near the intersection of Southeast 172nd Avenue and Big Timber Court near Clackamas.

The crash happened at about 1:30 p.m. Chastain was taken to a hospital as a precaution, deputies said. They said there isn't a booking photo available for Chastain.

Police said Chastain is a 17-year Portland police veteran and has been put on paid administrative leave, per standard protocol. He was most recently assigned to the police bureau's Tactical Operations Division.

The bureau will conduct an internal review of the incident after the sheriff's office investigation is complete, police said. The incident will be presented to the Police Review Board, as well.

The Clackamas County District Attorney's Office will also review the case, deputies said.

Portland police issued the following statement about Chastain's arrest:

"The Portland Police Bureau cannot comment further on a personnel matter because it could interfere with the process of conducting a neutral, objective internal investigation and the Bureau must protect public employees' privacy interests consistent with the Oregon Public Records Law and relevant collective bargaining agreements."

Excessive speed may have been a contributing factor to the crash, deputies said.

-- Jim Ryan

jryan@oregonian.com

503-221-8005; @Jimryan015