The multiple fatalities were at two locations: a mosque at Deans Ave and one at Linwood Ave.
"Again we are unsure if there are any other locations outside of that area," he said.
"We have mobilised every police resource in the Canterbury location to respond to this and we are also in the process of mobilising every national police resource to keep people safe."
Moath Owaidah, of the New Zealand Islamic Union Trust, said a large group were exiting their Friday prayer session at Masjid Al Maktoum mosque near Auckland Airport when they started getting calls about the shootings.
"We started getting calls from the Islamic community. The reaction of some of the people there, they were really shocked and very nervous about what happened, because it's something you don't expect here in New Zealand," Owaidah said.
"Especially here in New Zealand we preach for safety, we preach for a safe New Zealand. Even when we returned home we were still receiving calls, we still are now, it's very distressing and shocking. If it happened in Christchurch it could happen anywhere in New Zealand.
"A family that we know, their father was at the prayers, and they've been trying to get in contact with him and so far they haven't been able to, so we're still trying to get more information on that. People are worried."