Australian Federal Police may have carried out unauthorised spying on three separate occasions, it has been revealed.

These revelations come as Queensland looks to possibly bolster its counter-terrorist operations by introducing two new drones to its force.

The Commonwealth Ombudsman, Colin Neave, flagged the issue with Attorney-General George Brandis two months ago, The Australian reported.

Australian Federal Police may have carried out unauthorised spying on three separate occasions, it has been revealed

It is possible cameras or bugs put into a premises back in 2013 were left in place long after the person of interest had moved and continued to monitor the new residents of the home.

They have not been told of the situation because it is against AFP protocol to reveal confidential information.

The breach certainly raises questions about how two new drones acquired by Queensland police will be used.

The State Government refuses to reveal if the new additions will be used in counter-terrorism operations because it is top-secret information.

The Commonwealth Ombudsman, Colin Neave, flagged the issue with Attorney-General George Brandis two months ago

These revelations come as Queensland looks to possibly bolster its counter-terrorist operations by introducing two new drones to its force

The two drones have a combined cost of $23,000, with the purpose of monitoring criminal activity, and gathering photographs and videos of crime scenes.

Police Minister Jo-Ann Miller said evidence collected by the drones would be used in criminal cases before the courts.

But she will not discuss whether the flying robots will be counter-terrorist operations as well, citing national security concerns.

'I should not speak about that because we are on a high-terrorism alert,' Ms Miller said.

It is possible cameras or bugs put into a premises back in 2013 were left in place long after the person of interest had moved and continued to monitor the new residents of the home

'It's situation where we stand united with our federal counterparts to make sure that Queensland and Australia are always safe.'

The new drones were first deployed to help police examine the scene of a fatal house fire in Beenleigh that claimed the life of a two-year-old boy this month.