A number of bodies were recovered overnight and several victims died of their injuries in hospital.
"This morning we are going to remove the last part of the collapsed roof so we can recover more bodies, but we are not hopeful of reaching any survivors," Bilal Ahmad Faizi, spokesperson of the 1122 rescue agency, told the Agence France-Presse (AFP) news agency.
At least 20 police officers killed in the bombing were buried after a prayer ceremony.
This is the latest in a string of attacks targeting police.
What happened in the attack on the mosque in Peshawar?
A suicide bomber blew himself up inside a mosque in a security compound in Peshawar during afternoon worship on Monday. More than 300 worshippers were in the building at the time.
Following the blast, the majority of the roof caved in — injuring many more people, according to local police official Zafar Khan.
It remained unclear how the attacker was able to enter the high-security area, home to police and regional government headquarters, with explosives. No group has yet claimed responsibility for the attack.
The Pakistani Taliban denied it had been involved after an initial assertion by one of its commanders.
