Police remain surrounding the doors.
The accused is expected to appear soon.
A prisoner van arrived at the Christchurch Justice Precinct building escorted by armed police vehicles.
The court has been closed to the public for security reasons, although media are allowed to attend.
The police Eagle helicopter - which flew from Auckland to assist local police yesterday - is circling the court precinct.
More armed police have arrived to patrol the area on foot.
It's not clear where the accused, 28, was held last night.
The Herald understands he is expected to represent himself at the hearing this morning at the Christchurch District Court.
The media presence - including international agencies - outside the court is growing.
Some family members of those gunned down at the Al Noor mosque have also been at court.
Several told the Herald they wanted to "have a look" at the man accused of slaying their loved ones.
A vehicle drove slowly past court and a man screamed out "rot in f****** hell".
Many others are driving past the precinct and other members of the public have started to gather as the appearance time draws nearer.