49 people have now died after a terrorist attack on two mosques in Christchurch in New Zealand.
20 others are seriously injured after gunmen started shooting at worshippers.
Four people have been arrested - one of them is an Australian-born citizen.
New Zealand's security threat level has been increased to "high" and the prime minister says it's one of the country's "darkest days".
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Mosques in the city have been told to close and schools have been placed on lockdown.
Footage of the attack has emerged online.
Detectives say they want it taken down - describing it as disturbing.
