The country’s Prime Minister Jacinda Ardern said the threat would be raised after 40 people were killed.
Two mosques were targeted and bombs were planted on vehicles within three kilometres of the scene.
She had earlier told the media that the incident was “one of the darkest days in New Zealand’s history”.
She said a suspect was in custody, adding: “I can give that assurance, he has been apprehended. He is also accompanied by two other associates.”
Ms Ardern added: “I think we should be vigilant against the idea of extreme ideology and extreme violence and violent acts.”You’ll notice from the language that you hear from those who work in our intelligence and security services that their focus is on extremism regardless of where it comes from.
“We need to be blind in that regard. It needs to be absolutely focused on threat and ideology and extremism, because obviously that is what we have experienced here today.”
Current advice on official Government website Gov.co.uk states: “Although there’s no recent history of terrorism in New Zealand, attacks can’t be ruled out.
“You should be aware of the global risk of indiscriminate terrorist attacks, which could be in public places including those visited by foreigners.
“There’s a heightened threat of terrorist attack globally against UK interests and British nationals, from groups or individuals motivated by the conflict in Iraq and Syria.
“You should be vigilant at this time.”
More to follow…