"There were a few reports of IEDs strapped to vehicles which we were able to secure," he said, referring to improvised explosive devices.
He said it was not possible to assume that the attack was isolated to Christchurch, saying: "At this point in time we should never make assumptions." New Zealand media have reported that between nine and 27 people have been killed.
Business Insider reports Big tech is coming under renewed political pressure following the mass shootings at two New Zealand mosques on Friday. The attack was livestreamed on Facebook before spreading..