(AP) — The FBI is investigating four Honolulu police officers who are accused of forcing a man to place his mouth on a urinal inside a public restroom, according to the police department’s top official.

Honolulu Police Chief Susan Ballard said another officer reported the suspected misconduct after the officers responded to a complaint Sunday afternoon of a person trespassing in the restroom.

“If true, these allegations violate the core values the HPD stands for,” Ballard said. “Our officers are sworn to uphold the right of all persons, and I expect every officer to treat every member of the public fairly and with respect. Personally, I am appalled at the behavior, if it is true, and appropriate action will be taken.”