The shooter pleaded guilty earlier this year to 51 charges of murder, 40 charges of attempted murder and one charge of committing a terrorist act.

He says he doesn’t want to keep working at the kebab shop he ran with a business partner at the time of the attack and is now trying to sell his stake.

In the six-page letter, the accused warns that a "great conflict" is coming and uses language that could be construed as a call to arms.

New Zealand acted swiftly after two mosques in Christchurch came under gunfire on March 15, leaving 51 people dead and dozens more injured.

It's time to call it what it is, Rob Breakenridge writes: terrorism.

The El Paso massacre is the latest attack in which the gunman appears to have praised the mosque shootings in Christchurch.

Stoltenberg, making a two-day trip to New Zealand, visited Christchurch, where 51 Muslim worshippers were killed in the attacks on two mosques by a suspected white supremacist.

New Zealanders have handed over more than 10,000 guns, weapons parts and accessories in the first week of a buy-back scheme prompted by a mass shooting.

There was no indication that Friday's blast had any wider security implications.

The plans have aroused concern from the community in the South Island city, media said.