At least seven people including a couple received burn injuries from an explosion at a gas cylinder shop at Khobongpuria village in Khagrachhari Sadar upazila in the early hours of Tuesday.
Among them, four critically injured were transferred to Chattogram Medical College Hospital, said Shahadat Hossain Titu, officer-in-charge of Sadar Police Station.
The injured are Bhuban Bikash Chakma, 50, Abdul Hamid, 23, Md Jamir, 22, Mahmud Ullah, Newton Chakma, Mohiranjan Chakma and his wife Minoti Chakma.
A cylinder of the shop, in front of 'Youngster Club', exploded with a big bang around 4am, leaving seven people of adjoining shops injured, UNB reported.
The explosion also damaged parts of the wall of the club, witnesses said.