49 people confirmed dead and 48 injured.
One of the Terrorist arrested was an Australian citizen, reportedly Brenton Tarrant.
The Terrorist entered the crowded Al Noor mosque in Christchurch at about 1.45pm local time.
A second shooting took place at Linwood Masjid in Christchurch shortly after.
New Zealand Police Commissioner Mike Bush confirmed that four people had been apprehended.
The people currently in custody were not on a security watch list.
Newzealand PM Jacinda Ardern said it was “one of New Zealand’s darkest days”.