Police suspect the incident was caused by frozen gas.
Most of the injured were from nearby buildings, a few bus passengers and pedestrians.
In one building was the office of the online news portal 'Aparajey Bangla'.
79 on Outer Circular Road, Rashmono Specialized Hospital, Nazrul School, Arang Showroom, Bishal Center, Dom-Ino Commercial, Best Buy Showroom, Bengal Trades Center, Calcutta Dry Cleaners, Moghbazar Plaza, Hamdard Medical and Sales Center and the Vision Emporium Showroom.
[8] The blast also damaged three local buses and wounded their occupants.