More than 170 victims are to be buried on Monday while relatives of about 200 people still officially missing try to find out if they are dead or alive.
About half of the 330 or more people killed as the three-day siege came to a bloody end on Friday were children.
Two days of mourning have begun across Russia, and flags are at half-mast.
It is thought that more than 1,100 people had been held in the school, although there is no official figure.
The Russian Red Cross has appealed for international assistance to help overstretched local hospitals trying to treat the injured – who now number more than 560, according to the authorities.