An off-duty Secret Service officer was arrested in Miami-Dade County at around midnight Monday on charges of indecent exposure after allegedly masturbating in a hotel hallway, according to a police affidavit.

The officer, identified in the arrest record as John Spillman, 33, was placed on administrative leave, Richard Macauley, the chief of the Secret Service's uniformed division, said in a statement obtained by NBC station WTVJ.

"We are aware of the arrest of an off-duty Secret Service officer by the Miami-Dade Sheriff’s Office," Macauley said. "The alleged conduct is unacceptable and stands in stark contrast to the professionalism and integrity that I demand of our personnel."

"This agency takes these matters with the utmost seriousness," he added, saying Spillman would remain on administrative leave "pending the results of this criminal matter and a complete and thorough internal investigation."

The arrest was first reported by Fox and ABC affiliate WSVN.

According to the arrest affidavit, law enforcement officers responded to the DoubleTree by Hilton Miami Airport and Convention Center and allegedly found Spillman naked and masturbating at the end of a hallway. A guest on the same floor told the officers that the suspect had followed her from the hotel lobby "and they immediately entered their room because she was in fear for their lives," the affidavit said. Hotel security also alleged they saw the suspect masturbating, it said.

The Secret Service said Spillman was a Secret Service employee based in D.C. and was in Miami to provide security outside an event. The alleged incident took place after the event ended when Spillman was off duty, the agency said. NBC News has reached out to the Secret Service for details on the event itself.

Spillman did not have a lawyer named in the case docket as of Tuesday morning. The county public defender's office declined to comment to NBC News.

A hearing for the suspect is scheduled for May 27.