CHRISTCHURCH, New Zealand — New Zealand police say they have taken into custody three men and one woman over the shootings at two mosques in Christchurch.
Prime Minister Jacinda Ardern called the events Friday afternoon "one of New Zealand's darkest days."
The shootings during Friday prayers involved multiple fatalities but authorities have not said how many.
New Zealand Police Commissioner Mike Bush said police have defused a number of improvised explosive devices found on vehicles after the mosque 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.
Ardern at her news conference alluded to anti-immigrant sentiment as the possible motive, saying that while many people affected by the shootings may be migrants or refugees "they have chosen to make New Zealand their home, and it is their home. They are us. The person who has perpetuated this violence against us is not."
Authorities have not yet said how many people were killed and wounded. "It's a very serious and grave situation," Bush said.
The deadliest shooting occurred at the Masjid Al Noor mosque in central Christchurch at about 1:45 p.m.