A COUNTER-terrorism investigation is underway in Coffs Harbour following Friday's devastating terrorist attack in Christchurch at the hands of Grafton man Brenton Tarrant.
Tarrant has also broadcast the massacre live on social media, using a head-mounted camera, which sparked an outcry across the world as platforms such as Facebook were slow to take down the grisly footage.
Police raided the home about 8.30am local time (10.30am NZT) on Monday, and shortly after executed a search warrant at a home in Lawrence.
The primary aim of the activity is to formally obtain material that may assist New Zealand Police in their ongoing investigation.
"The community can be assured that there is no information to suggest a current or impending threat related to this search warrants".
"The NSW JCTT is unable to provide further detail regarding this matter", police said in a statement.
Tarrant's grandmother Marie Fitzgerald in an interview with Channel 9 about her son.
Tarrant's uncle, Terry Fitzgerald, apologised to the families of the dead and injured in New Zealand.
The 81-year-old said her grandson was "obviously not of sound mind?".
A year ago he returned to Grafton for his sister's birthday and family did not notice anything wrong.
It's understood Tarrant's mother works in that region.
Pakistan's flag is flying at half-staff today in solidarity with the victims of terrorist attacks on two mosques in New Zealand.
At a news conference Sunday, Ardern said the police will be filing additional charges against Tarrant, who is being held under high security in a special facility. He will return to court on April 5.
"There is only so much content that can be covered, assessed and analysed by ASIO and other partner agencies", said Dutton.
Dutton said Australia's security agencies are very concerned about retaliatory or copycat attacks in the wake of the Christchurch terror attack.