The man accused of killing 50 people in last month's attacks on two mosques in Christchurch, New Zealand, has been ordered to undergo mental health tests.
He would be seen by experts to decide if he was fit to stand trial or insane, said high court judge Cameron Mander.
The suspect faces 50 murder charges and 39 attempted murder charges, according to a BBC report Friday.
Australian Brenton Tarrant, 28, appeared in the courtroom on Friday - packed with relatives of some of the victims - via video link from prison.
He was not required to enter a plea.
It was the deadliest mass shooting attack New Zealand has ever seen.
New Zealand Prime Minister Jacinda Ardern called it one of New Zealand's "darkest days".
She has vowed to ban all types of semi-automatic weapons and assault rifles.
What happened in the court?
On Friday morning, Judge Mander ordered that two assessments would be carried out to determine the state of the suspect's mental health.
The suspect listened intently during the short court hearing. He made no comments.
The suspect was able to see the judge and lawyers and hear the proceedings - but the camera was turned away from the public gallery.
The judge remanded him in custody, and his next court appearance is now due on 14 June.
Omar Nabi lost his father in the attack on the Al Noor mosque. Speaking to reporters outside the court he said "we don't want to kill him. We want him to suffer here".
"We want him to be punished, you know, a punishment for a crime of killing 50 people and injuring how many."
Tofazzal Alam who survived the attack on the Linwood mosque also spoke to reporters outside the court.
"I lost 50 friends whom I use to see in the mosque every Friday. And during the shooting, I couldn't see him. I want to see how he feels after killing 50 people, so that's why I'm here today."
How did the attacks unfold?
The suspect was arrested on 15 March for his involvement in the shootings at the Al Noor mosque and the Linwood Islamic Centre, both located in Christchurch.
Tarrant had allegedly first driven to the Al Noor mosque, parked nearby and began firing into the mosque as he walked in through the front entrance.
He allegedly fired on men, women, and children inside for about five minutes. The shooter live-streamed the attack from a head-mounted camera and identified himself in the footage.
The suspect is then said to have driven about 5km (three miles) to the Linwood mosque where the second shooting occurred.
The gunman, armed with semi-automatic rifles including an AR-15, is believed to have modified his weapons with high-capacity magazines - the part of the gun which stores ammunition - so they could hold more bullets.
He is currently being kept in isolation at the Auckland Prison in Paremoremo, considered New Zealand's toughest.