Md Walid Hossain, deputy commissioner (media) of Dhaka Metropolitan Police, the comittee was formed with DMP’s Joint Commissioner (crime) Md Shah Abid Hossain as its head.
The committee will submit their findings within three working days, he added.
Five people, including four policemen, were injured in the explosion.
The injured policemen are -- Inspector (operation) Imran, Sub-Inspector Sajib Khan, two probationary sub-inspectors (PSI) Rumi and Ankush and Riaz.
The explosion took place around 7am when a weight-machine like object went off at the police station, leaving the policemen injured, Walid told media earlier.