India, June 2 -- A pair of siblings, aged four and seven, died early Sunday morning after being critically injured in a CNG cylinder explosion at a godown in Sunder Nagri, northeast Delhi on Saturday evening, police said. The victims' nine-year-old brother, and a 25-year-old godown worker, are still undergoing treatment in a hospital and are said to be critical, police added.

The godown was used to store, repair and resell old CNG cylinders and was illegal since it was inside a residential building, police said. The explosion occurred at 4.30 pm, police said.

"The cylinder exploded during repairs, and the force blew open the godown's iron gate which then fell on three siblings, aged four, seven and nine, who were playing outside the god...