While Sajith (24) of Palakkad died on the spot yesterday, Dhanesh (22), also from Palakkad, succumbed to injuries in the hospital today.
The explosion occurred while transfering cooking gas from a large cylinder to small ones, they said, adding, some the injured were admitted to hospital in a serious condition.
No proper safety precautions were made in the unit located at the top floor of the dwelling place.
A case had been registered against the owner of the unit, police said.