89 persons were killed and over 100 were injured in the September 12 blast caused by mining explosives.
The rally was taken out last evening by the women folk under the banner of Naari Shakti Manch from Shraddhanjali Chowk carrying placards with the photographs of deceased persons demanding justice for them.
Men and children also took part in the rally expressing anguish over slow probe in the case.
Protestors, mostly women alleged that police have been going 'soft' on Kasawa and his relatives in the case, which is being probed by the Special Investigative Team (SIT).
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The women have also handed over a memorandum to the SIT head, Additional SP, Seema Alawa in this connection.
The memorandum also demanded to conduct polygraph test, narco analysis test and adopt other scientific techniques while questioning relatives and associates of the main accused.
The residential building in which the explosion took place is owned by Kasawa, who reportedly has a licence for use of explosives in digging of wells.
According to police, he had stored a huge quantity of explosives including gelatin sticks in the building.
Kasawa had been booked under 304 (manslaughter) of IPC and other sections of Explosive Substance Act, after the incident.