New Zealand's Prime Minister has described multiple shootings in Christchurch as causing "one of New Zealand's darkest days."

New Zealand's Prime Minister has described multiple shootings in Christchurch as causing "one of New Zealand's darkest days." The country is in shock after multiple people were killed and injured as gunmen opened fire inside two mosques in the southern city.

People wait outside a mosque in central Christchurch, New Zealand Source: AAP

Police say they have four people - three men and a woman - in custody and have impounded several vehicles with improvised explosive devices attached to them. Australian Prime Minister Scott Morrison has confirmed one of the men taken into custody is an Australian citizen, describing him as a "right-wing terrorist".