Chief Police Officer Rudi Lammers said on Tuesday the error was being investigated and assured the community the Twitter account was safe.

"This was an unintentional error by a member of ACT Policing outside the ACT Policing media team who inadvertently re-tweeted a tweet on the ACT Policing Twitter account," Assistant Commissioner Lammers said.

"The member immediately saw the error and reported the incident to AFP Professional Standards.

"This is now the subject of an AFP Professional Standards investigation therefore I am unable to comment further until that investigation has been completed."

In the meantime, ACT Policing social media protocols were being reviewed.