ACT police have been left red-faced and over-exposed after their official Twitter account retweeted a pornographic image and favourited multiple others.

On Wednesday, the ACT police account retweeted a risque image from an account with the name Katie Sanders.

The account contained selfies of a woman with full-frontal nudity along with the hashtag #ThonglessThursday.

Later police issued a tweet saying they were not sure how the image got onto their Twitter page, which was usually reserved for traffic information and breaking news.

Police said they were investigating the incident, but would not confirm if they had been hacked.

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Staff were quick to delete the retweet and unfollow Katie Sanders, but not before plenty of Canberrans had pounced on the mistake.

They were slower to unfavourite tweets from the official account, allowing some images to be found much later in the afternoon.

Police reassured their almost 7,000 followers that the account was secure and promised get to the bottom of the cheeky incident.