A man has appeared in court charged with murder after at least 49 people were killed in terrorist gun attack on two mosques in New Zealand.
New Zealand police tweeted that the suspect appeared in court in Christchurch, adding that "further charges will be laid".
There was no detail given of any plea entered.
Prime Minister Jacinda Ardern said three people had been arrested in the wake of the attack.
A fourth person arrested on Friday who was in possession of a firearm, but with the intention of assisting police, has since been released.
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The force tweeted: "While the man is currently facing only one charge, further charges will be laid. Details of those charges will be communicated at the earliest possible opportunity."
Police added that 45 additional officers were deployed to Christchurch from other districts, with another 80 being drafted in today.
They tweeted: "A complex investigation is under way into this terrible attack, and police have a number of a priorities today in terms of investigation and intelligence gathering.
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"However another absolute focus for us is to ensure that the victims of this attack, including family members and loved ones of those killed and injured, have the best possible structures in place to provide support and welfare."
Australian Prime Minister Scott Morrison earlier confirmed one of the people arrested was an Australian citizen, and described the suspected attacker as an "extremist right-wing violent terrorist".
New Zealand is in mourning following Friday's massacre, the deadliest in the country's history.
Forty-one people were killed at the Masjid Al Noor mosque on Deans Avenue in central Christchurch, seven were killed at the suburban Linwood Masjid Mosque, and one person died at the Christchurch Hospital.
New Zealand: Christchurch shootings - In pictures
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Ms Ardern said in a press conference that the country's gun laws would change in the wake of the attack.
The suspect held a Category A gun license which enabled him to legally obtain semi-automatic weapons, she said.
She added: "While the nation grapples with a form of grief and anger that we have not experienced before, we are seeking answers."
The suspect, who appeared to live-stream the massacre, has been named in media reports as Australian man Brenton Tarrant.
People gathering at mosques around the world after New Zealand attack
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Authorities said at least 48 people were wounded following the attack. The identities of the dead and wounded have not been released.
Several of those killed or wounded were from the Middle East or South Asia, according to initial reports from several governments.
Mosques in New Zealand have been closed as security remains tight following the incident.
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The gunman left a 74-page manifesto that he posted on social media, identifying himself as a white supremacist.
He also livestreamed in graphic detail 17 minutes of his rampage at Al Noor Mosque.
Several more people were killed in an attack on a second mosque in the city a short time later.
In the aftermath, the country's threat level was raised from low to high, police warned Muslims against going to a mosque anywhere in New Zealand, and the national airline cancelled several flights in and out of Christchurch.
World leaders condemned the attacks and offered condolences. Pakistan's Prime Minister Imran Khan and other Islamic leaders pointed to the bloodbath and other such attacks as evidence of rising hostility toward Muslims.
"I blame these increasing terror attacks on the current Islamophobia post-9/11 where Islam & 1.3 bn Muslims have collectively been blamed for any act of terror by a Muslim," Mr Khan tweeted.
UK Prime Minister Theresa May offered her "deepest condolences to the people of New Zealand."
The Queen said she was "deeply saddened by the appalling events in Christchurch today. Prince Philip and I send our condolences".
Mayor of London Sadiq Khan said "Londoners of all backgrounds stand together in solidarity with our friends in New Zealand".
German Chancellor Angela Merkel said she mourned "with New Zealanders for their fellow citizens who were attacked and murdered out of racist hatred while peacefully praying in their mosques".
While French President Emmanuel Macron called it an "odious attack" and said France stood "against any form of extremism".
US President Donald Trump tweeted, "We stand in solidarity with New Zealand" and pledged to give the country any assistance it needs.
In the wake of the slaughter, the prime minister said that immigrants and refugees "have chosen to make New Zealand their home, and it is their home. They are us."
She said the suspects harbour "extremist views that have absolutely no place in New Zealand."
Across the UK, there has also been several vigils held for the victims of the attack.
In Finsbury Park, north London, several people gathered "in a vigil of solidarity for the Muslim community" with signs that read: "No to Islamophobia and anti-Semitism." Labour leader Jeremy Corbyn was also in attendance.
Another London vigil was also held in Hyde Park, where many people from New Zealand reportedly attended to pay tribute.
A vigil was also held in Glasgow, as several people gathered to pay their respects.
And in Belfast, a vigil was held outside of the City Hall.
Facebook, Twitter and Google companies scrambled to take down the gunman's video, which was available on social media for hours after the horrific attack.
The second attack took place at the Linwood mosque about 5 kilometres (3 miles) away.
Mark Nichols told the New Zealand Herald that he heard about five gunshots and that a worshipper returned fire with a rifle or shotgun.
Christchurch is home to nearly 400,000 people and is sometimes called the Garden City. It has been rebuilding since an earthquake in 2011 killed 185 people and destroyed many downtown buildings.
Before Friday's attack, New Zealand's deadliest shooting in modern history took place in 1990 in the small town of Aramoana, where a gunman killed 13 people following a dispute with a neighbour.
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