The explosion forced the evacuation of 4,900 people from the city, shut the local thermal power station, and sparked fears of an energy crisis in the country.
Black smoke from the ensuing fire spread up to 100 kilometers (62 miles) towards Cuba's capital city of Havana.
During the weekend, firefighters sprayed water on the remaining 10 fuel tanks to keep them cool and prevent the spread of the fire.
[4] Local officials warned residents to wear facemasks and stay indoors to avoid the sulfur dioxide smoke.
The smoke also contained nitrogen oxide, carbon monoxide and other poisonous substances with the risk of acid rain.