A 38 year-old prison guard is under investigation for multiple incidents of alleged sexual assault on three inmates at the Women’s Community Correctional Center in Kailua over a two-year period.

The suspect, who was hired in October 2007, was temporarily transferred in January 2016 from the Kailua women’s facility to the minimum-security Waiawa Correctional Facility.

The police said the female victims, ages 30, 31 and 34, were allegedly assaulted from March 2013 to November 2015.

The suspect was arrested on 37 counts of sexual assault and attempted sexual assault. He was arrested at the Waiawa facility at 6:10 p.m. Thursday and released two hours later, and no charges have been filed while the investigation continues.

No other details were released by the police or the Department of Public Safety, which is conducting its own investigation.

An internal administrative investigation is also being conducted, as is standard procedure whenever there are allegations of abuse, said Toni Schwartz, a spokeswoman for the prison facilities.