The federal coalition has called for an inquiry into the circumstances surrounding the resignation of a member of Prime Minister Julia Gillard's media unit.
The news comes after a protest on Thursday by tent embassy supporters that sparked a security scare at a Canberra restaurant.
It also follows claims made on Macquarie Radio by broadcaster Ray Hadley that someone from her office had contacted the tent embassy in Canberra to tell protesters the location of Opposition Leader Tony Abbott, who was with Ms Gillard.
While the media adviser - named as Tony Hodges - did not directly tell tent embassy organisers where Mr Abbott was, the person he did tell passed that information on.
"A member of the Prime Minister's media unit did call another individual yesterday and disclosed the presence of the Opposition Leader at the Lobby restaurant," a spokesperson said in a statement.
"This information was subsequently passed onto a member of the Aboriginal Tent Embassy."
Coalition frontbencher Christopher Pyne said the actions of the staff member were being taken very seriously by the opposition.
"The prime minister should immediately initiate an Australian Federal Police (AFP) inquiry into who the schedule was released to, and for what purpose, and into whoever was involved in the decision to breach the leader of opposition's security," Mr Pyne told AAP.
"The opposition finds it remarkable that the staffer would have acted unilaterally and we believe the prime minister needs to do more than simply scapegoat one staffer."
Mr Pyne said the action also showed the Labor party was obsessed with Mr Abbott.
"What this shows is the government has no ideas worthy to put before the Australian people and it is obsessed in tearing down Tony Abbott," he said.
The prime minister's spokesperson said the staff member did not "in any way" suggest or encourage violence or demonstration.
"Nevertheless, given the circumstances of yesterday's function at the Lobby Restaurant, this action was an error of judgment," the spokesperson said.
"As such the staff member's resignation has been accepted."
Comments made on Thursday by Mr Abbott sparked a protest by Aboriginal activists who bailed up him and Ms Gillard in a restaurant near the tent embassy, which was set up outside Old Parliament House 40 years ago.
The protesters believed Mr Abbott had suggested it was time to move on from the embassy.
In extraordinary scenes, the coalition leader and Ms Gillard were forced to run a gauntlet of protesters after police and security feared for their safety and advised them to leave the venue.
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