Prime Minister John Key said he was deeply disappointed about the leaks from the Ministry of Foreign Affairs and Trade and that most diplomats would be ashamed at what had happened.
The most significant leak was of a cabinet paper last week that was considered by a cabinet committee considering changes to the proposed restructuring of the ministry.
Other leaks - the Labour Party - included letters from various diplomats to chief executive John Allen setting out their opposition to the proposals.
Mr Key said at his post-cabinet press conference this afternoon that only about 20 people had access to the leaked cabinet paper.
"I was deeply disappointed because at the end of the day these are people charged with diplomacy and are charged with I think upholding the highest standards by virtue of the jobs that they hold and they completely failed that test."