The staff member monitoring the accounts sent it to parliamentary services as soon as they saw it, who sent it to police, the spokesman said.
The visiting Bangladesh cricket team was arriving for prayers at one of the mosques when the shooting started but all members were safe, a team coach told Reuters.
Mr Bush said two of those in custody were arrested at the scene, and that police were working to establish whether they had had any involvement in the incident.
Police said Tarrant tried to evade arrest and did not surrender voluntarily.
Ardern said 39 people remained in hospital, of whom 11 were in intensive care.
A short distance away, 39 people were being treated in hospital for gunshot wounds and other injuries inflicted in the massacre. But it has been a pleasure to know you all, guys. The father in the family was killed, one son was wounded and another was missing, he said, citing information he had received from a friend of the family.
A total of 49 people were killed and at least 48 were wounded in two shootings at a pair of mosques in Christchurch.
He said New Zealand's reputation as a peace-loving nation could also have been a factor in the planning.
The victims of Friday's shooting included immigrants from Jordan, Saudi Arabia, Turkey, Indonesia, and Malaysia. "I'm sure this bloody crime doesn't represent the New Zealanders".
Ardern, who flew to Christchurch on Saturday, said she had spoken to Trump, who had asked how he could help.
In 1979, Haji Daoud Nabi escaped the Soviet-Afghan war and took his young family to safety in New Zealand. And there's a lot of tolerance here, it's diverse and friendly.
"I think something must have changed in him during the years he spent travelling overseas", Gray told national broadcaster ABC. Dirie had been worshiping in Christchurch that morning with his five children when the gunman opened fire. "Hopefully she will be so much better", he said. TIME spoke with Christians, Hindus, Sikhs, and Muslims all desperate not to let this tragedy redefine who they are.
'I can tell you one thing right now, our gun laws will change, ' Ms Ardern told reporters.
Rules in New Zealand require gun owners to be licensed, but unlike neighboring Australia, laws do not require all weapons to be registered, giving authorities poor oversight of the country's firearms, according to GunPolicy.org. As a result of the attack, she has upgraded the country's terror threat level from low to high. Additionally, New Zealand does not ban the ownership of semi-automatic military-style assault weapons, also in contrast to Australia.
"Has there been travel to the United States?"
"The street that I work on was covered in SWAT cars, they were flying past every minute, and loads of police cars going back and forth, so that must have been when they found out that there were attacks in at least two places, the first mosque and the second mosque". Versions of the video reportedly persisted on the sites for hours after the shootings.
Like the wider Muslim community in Christchurch, Egypt-born AbdelHalim is struggling to come to terms with the violence wrought upon worshippers this week as he waits to bury the dead.
Pacific Islands Forum Chair and president of Nauru Baron Waqa expressed his "deepest condolences" to the people and government of New Zealand on what he called a sad day for Christchurch and a sad day for the region. She said four people in police custody held extremist views, but had not been on any police watchlists.
Paul Buchanan, a security analyst at the 36th Parallel consultancy, said between 1% and 2% of Christchurch's 340,000 inhabitants were Muslim. Political and Islamic leaders across Asia and the Middle East voiced concern over the targeting of Muslims.
New Zealand mass shooting suspect charged with murder
Canadian Muslims have expressed their sadness and shock at the shooting deaths of 49 worshippers at two mosques in New Zealand . Tarrant has spent little time in Australia in the past four years and only had minor traffic infractions on his record.
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