I also want to say that the number of injured is also 50.
At least 49 people have died, seven at Linwood Masjid Mosque and 41 at Masjid Al Noor Mosque.
Hungry for any news, families and friends of the victims gathered at the city's Hagley College, near the hospital.
The judge said "it was reasonable to assume" more such charges would follow.
At least 49 people are confirmed dead, with more than 40 people injured following attacks on two mosques in Christchurch on Friday afternoon.
Australian Prime Minister Scott Morrison described the suspect as an "extremist right-wing violent terrorist".
The Christchurch attacker could have killed even more people as he was on the move at the time of his arrest, and had more firearms in his vehicle, New Zealand's PM said, praising police who responded to the call in just 36 minutes.
During her press conference, Arden said banning such weapons was "certainly one of the issues that I'm looking at with immediate effect".
Two other people were in custody and police said they were seeking to understand whether they were involved in any way.
"Unfortunately, we are all too familiar with the devastating effect a mass shooting has on a faith community", said Meryl Ainsman, chair of the board of the Jewish Federation of Greater Pittsburgh.
Ardern addressed New Zealanders hours after the attacks-which appears to have been driven by the white nationalist, anti-immigrant, and Islamophobic beliefs of the suspected attacker-to unequivocally call the shooting an act of terror and to say that the suspect had legally obtained the guns he used and had been able to modify them, allowing him to own the weapons without registering them.
"We think also of our Cook Islands community in Christchurch and in New Zealand, with so many of our people who have made their homes there".
Khokhur, 58, and husband Mehaboobbhai Khokhur, 65, had travelled from India to spend time with their son Imran, their first visit in the eight years since he moved to New Zealand.
Pakistan's High Commissioner said six citizens had been killed and three were missing.
New Zealand's attorney general, David Parker, took it step farther and vowed to ban semi-automatic guns at a vigil on Saturday, but later backtracked as reported by The New York Times.
"I can't even go to the mosque now because I am scared of that happening again", the 16-year-old told New Zealand television. Prime Minister Narendra Modi Friday wrote to his New Zealand counterpart expressing his deepest condolences to the bereaved families of the victims. There are an estimated 1.5 million firearms in New Zealand, which has a population of only five million, but the country has had low levels of gun violence.
Ardern called on the USA government to show "sympathy and love for all Muslim communities", and told the press that "the person who has committed this violent act has no place here".