The Rapid Action Battalion has condoned off a house in a slum near the Jurain Rail Gate area in the capital.
Commander Khandaker Al Moin, director of RAB's legal and media wing, confirmed the information around 12:30am on Friday.
A huge stock of cocktails, petrol bombs, and explosive-making equipment were recovered from the house.
RAB's Bomb Disposal Unit has left for the spot.
A rescue operation is going on till the writing of this report.