The organisation responsible for signalling the start of Eid is investigating whether their website was hacked.
The Muslim holiday was mistakenly signalled too early in New Zealand, leading to much confusion in the community.
The festival to end Ramadan, a month of fasting and self-reflection, is one of the most important holidays on the Islamic calendar.
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The Federation of Islamic Associations of New Zealand (FIANZ) is responsible for advising when there's been a new moon so celebrations can begin. The announcement went up on its social media page on Tuesday night, but was later retracted.
The association says it was a draft letter that was posted. They're investigating whether it was the result of a hack and have alerted police.
"An internal investigation is on to look at what went wrong and how this has happened, including the hacking," former FIANZ President Dr Anwar Ghani said.
The post drew criticism and confusion from the Muslim community. When Javed Dadabhai, organiser of Eid celebrations at Eden Park, saw it, he told hundreds of contractors they could start setting up for the festival.
"To call them back an hour later and say 'hey guys I'm really sorry but we got a false message'...they just rolled with it, so there was not one organisation that made a fuss."
Twenty-four hours later, the celebrations did finally begin.
While there was a police presence at Eden Park on Thursday, it wasn't the heavily armed guards seen at recent events - and that will change outside mosques too.
In Christchurch there's no longer a police guard outside the mosques where the March 15 attacks happened.
"Despite the fact we have left our static guard positions outside the mosques and Islamic Centres, I can guarantee you we will continue to be there for you," Superintendent Naila Hassan said.