"We have some leads but we cannot share them with you now, it will be done at an appropriate time", City Police Commissioner Raghavendra Auradkar told PTI.
He said they were yet to receive the analysis report of the Forensic Science Laboratory (FSL) on the materials collected at the blast site.
Director FSL, B Dayanand said "we are still analysing the material. It will take some time for us to give the report".
Four special squads have been formed to probe the blast which had occurred on April 17 when the BJP office located in a crowded residential locality was abuzz with activity in view of the May five Assembly polls.