A social networking page, where photos of police had been posted, has been pulled - amid concerns it could have been used to single out officers to be murdered.
It followed condemnation from the Police Federation - which expressed fears details gathered on officers could be used in murder bids.
It's not yet clear whether the site was removed by Facebook or by those responsible for setting it up.
The page encouraged people to post images and details of officers involved in operations across Northern Ireland.
A description on the site read that the aim of the group was to keep people updated on attacks, intimidation and harassment by the Crown Forces.
Chairman of the Police Federation, Terry Spence said that the information and the images contained on the site could be used by terrorists.
The page, which had almost 300 members, was set up after the recent arrest operation by detectives investigating the murder of PSNI Constable Ronan Kerr.
Last week Sinn Féin described the operation as "heavy handed and reminiscent of the bad old days".
Around 200 PSNI officers and other staff were involved in a series of raids across counties Down, Tyrone, Derry and Antrim.
Properties were searched in areas including Coalisland, Toome, Bellaghy, and Ballyronan and the men were arrested under the Terrorism Act.
They were released soon after.