Fire Superintendent Jaime Ramirez said the fire that erupted in Parola Compound, Tondo late Monday was caused by an explosion of an LPG tank.
A radio report said the tank owner, Alfredo Puro, had just bought the LPG tank when it started to leak.
Puro tried to get rid of the tank and brought it into a narrow alley when it suddenly exploded near the house of his neighbor who happened to be cooking.
The fire then swept through the nearby houses.
The Bureau of Fire Protection said about 37 injured persons were brought to the hospital, but according to the tally of the barangay (village), 42 were hurt in the incident.
Residents who suffered minor burns have been discharged from the hospital.
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