The Australian Federal Police raided a former top defence adviser's home as it continues the controversial investigation into leaks to the media.

Officers raided the Canberra house, owned by intelligence officer Cameron Gill, at 7am on Wednesday. According to a title search, Mr Gill co-owns the home with his wife, Australia's Ambassador to Iraq Dr Joanne Loundes. There is no suggestion Dr Loundes was a target of the raid.

AFP officers depart after the raid on the home in Canberra. Credit:Alex Ellinghausen

Mr Gill had been seconded from the department to work in the offices of Turnbull government ministers Dan Tehan and Mal Brough, both of whom occupied defence-related portfolios. On Wednesday evening Nine reported he works at the Australian Signals Directorate.

The AFP refused to confirm if the early morning raid was linked to June raids at News Corp journalist Annika Smethurst's home and the ABC's Ultimo headquarters.