UK's Prince William visits New Zealand mosques attacked by gunman, meets survivors

"Extremism in all its forms must be defeated," he said.

William made the two-day visit to New Zealand on behalf of his 93-year-old grandmother Queen Elizabeth, New Zealand's head of state, following a request by Ardern.

Preceded by a large contingent of police and watched by a police helicopter overhead, he was greeted by Ardern and the imam of Al Noor mosque, Gamel Fouda.

He was due to visit the Linwood mosque, where another seven people were killed, later on Friday.