A St. Croix (Wis.) County sheriff’s deputy was placed on paid leave this week after an alcohol-related arrest in North Dakota.

Ryan D. Fowler was arrested Wednesday on suspicion of being in physical control of a vehicle while under the influence of alcohol, according to a Bismarck police report.

Fowler, 35, was one of four St. Croix County deputies sent to North Dakota to assist authorities with protests where the Dakota Access Pipeline is being constructed.

St. Croix County Sheriff John Shilts confirmed the arrest Friday and said Fowler has been placed on paid administrative leave while the incident is investigated by the department’s office of professional standards.

“And then I’ll make a determination of discipline,” he said.

The report lists only that the incident occurred at 11:24 p.m. on East Interstate Avenue in Bismarck. Fowler is listed as the operator of a Ford Explorer that was involved in the incident, according to the report.

Shilts didn’t elaborate on the circumstances surrounding the arrest, saying he hadn’t yet seen the full report.

“But I’m certainly disappointed,” he said. “And that’s an understatement.”

Shilts said he has taken Fowler off the department’s K-9 unit. Fowler joined the unit in 2015.

Arraignment in the case is set for Oct. 31 in Burleigh County, N.D.