An expert on defence and security says more information is needed on how the Government's spy agency Communication and Security Bureau (GCSB) under-reported the number of authorisations it has to spy on people.
The GCSB has had to correct figures in its annual report on the number of interception warrants and computer access authorisations it has and apologised on Thursday for the mistake.
It changed the number of warrants from 11 to 16 and access authorisations from 23 to 37.
Lecturer in security studies at Massey University, Rhys Ball, says the mistakes are disappointing and embarrassing.
But Dr Ball says he does not think the errors point to a conspiracy..
The Labour Party meanwhile, says the latest mistake is shocking.
Labour leader David Cunliffe says the scale of the bungling is absolutely appalling, and the latest mistake does nothing to help restore the public's confidence in the agency.