A 30-year-old Northern Territory police officer is in custody facing a string of serious sexual assault charges including rape, NT Police said.

The male officer was arrested sometime before Saturday morning when police issued a brief statement about the matter.

Police said the officer was charged with sexual intercourse without consent, as well as “choking, strangling or suffocating in a domestic relationship and aggravated assault”.

It was unclear when the incident or incidents are alleged to have occurred, or over what period of time.

The officer, who has not been named, will remain in custody and is expected to appear in Darwin Local Court on Monday.

“The matter is under investigation by the Professional Standards and Domestic Violence Command,” the statement said.

“As the matter is now before the courts, no further information will be provided.

“This information is provided in accordance with the NT Police Transparency Guidelines.”