Multiple people have been killed in mass shootings at two mosques in New Zealand and four people have been taken into custody.

Prime Minister Jacinda Ardern described it as “one of New Zealand’s darkest days” and said the events in the city of Christchurch represented “an extraordinary and unprecedented act of violence”.

Three men and one woman were taken into custody, Police Commissioner Mike Bush said.

He said police had defused a number of improvised explosive devices found on vehicles after the shootings.

A man who claimed responsibility for the shootings left a 74-page anti-immigrant manifesto in which he explained who he was and his reasoning for his actions.

He said he considered it a terrorist attack.

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