A bomb each was found near the Police Information Room, in children's park and a place opposite the Magadh Mahila College, all on Gandhi Maidan, Deputy Superintendent of Police (City) Manoj Kumar Tiwari said.
The three bombs were recovered within a couple of hours of each other, he said.
Late this evening, two more bombs were recovered from the park and the place opposite the college, police sources said.
The seizure was made ahead of tomorrow's rally at the Maidan by CPI(M-L) Liberation.
Seven blasts had rocked the Maidan and surrounding areas on Sunday to coincide with the 'Hunkar' rally addressed by BJP prime ministerial candidate Narendra Modi.