A search warrant has been executed by police in Christchurch following a threat against Al Noor Mosque on Sunday.
Police say a 19-year-old man has been charged on an unrelated matter and they are continuing to speak with him.
Evidence will continue to be gathered in relation to the mosque incident, police said in a statement on Wednesday.
On Sunday night, an individual posted a message in both English and Ukrainian to an online message board, which was accompanied by an image of a person wearing a balaclava outside the Al Noor Mosque.
Canterbury District Commander Supt John Price confirmed a search warrant was executed on Wednesday morning at a Christchurch address.
"Police located a number of items at the address, including a vehicle, and we are currently speaking to a 19-year-old-man from the address," Supt Price said on Wednesday afternoon.
"On behalf of NZ Police, I want to thank those members of the community who alerted us to the recent threat against Al Noor Mosque."
The Muslim community had urged its members to be extra vigilant following the threat. Supt Price said further sharing of the threatening image is causing "significant stress and anxiety".
"This type of imagery has no place," he said. "It is abhorrent and will not be tolerated."
Supt Price said the image has been referred to the Chief Censor. Police say anyone who hears or sees anything concerning should report it immediately.