One of the occupants was a senior adviser in the Office of the Minister for Defence Materiel and Science, while the other was a senior career officer with the Department of Foreign Affairs and Trade. It is unclear whether the adviser still works in the minister's office.

Police will not say what prompted the raid on Wednesday, nor who the target was, but said the search warrant did not relate to any current or impending threat to the Australian community.

"As this is an ongoing matter, it would not be appropriate to comment further at this time," an AFP spokesperson said.

Police officers emerged from the home carrying black garbage bags of material. They did not respond to questions from waiting media.

The operation comes three months after federal police raided the Canberra home of News Corp journalist Annika Smethurst and the Sydney headquarters of the ABC.

The consecutive June raids were in relation to separate stories based on leaked government information.

Crossbench senator Rex Patrick urged the AFP to be transparent about why officers were raiding the home.

The Canberra Times