WELLINGTON, May 30 — A security breach that led to the premature release of New Zealand’s budget resulted from an online bungle, not a sophisticated cyberattack as originally claimed, red-faced officials admitted today.

The Treasury department called in police this week after the opposition National Party released parts of the government’s annual budget, which was not due for release until today.

At the time, Treasury Secretary Gabriel Makhlouf said his department had fallen victim to a “systematic” and “deliberate” hack, rejecting “absolutely” any suggestion the information had been accidentally posted online.

He was forced into an embarrassing backdown today after police found no evidence that illegal activity was behind the leak.

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“On the available information, an unknown person or persons appear to have exploited a feature in the website search tool but... this does not appear to be unlawful,” Makhlouf said in a statement.

He said Treasury prepared a “clone” website ahead of the Budget’s release but did not realise that entering specific search terms on it revealed embargoed information.

Budget documents are a closely guarded secret and Makhlouf said an inquiry would be held to ensure such a breach was not repeated.

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This year’s document is the centre-left government’s inaugural “well-being” budget, which it says is a world-first attempt to change the way economic progress is measured, putting people ahead of growth.

National leader Simon Bridges called for Makhlouf’s resignation, saying the Treasury boss knew about the bungle days ago because his department fixed the website bug before police were called in.

He accused Makhlouf of sitting on the information and instead going public with an accusation that implied National had carried out an illegal hack.

“Clearly his position is not tenable,” Bridges told reporters.

Finance Minister Grant Robertson, the minister responsible for the budget, declined to publicly back Makhlouf, who is due to leave his position next month and become governor of the Central Bank of Ireland.

“I am... very disappointed that the Treasury did not seek to find more information as to how this happened before referring the matter to the police,” he said in a statement.

He refused to address the matter further in the budget media lock-up at parliament, which Makhlouf did not attend, contrary to normal practice. — AFP