A deadly fire that consumed at least half of a large oil storage facility in western Cuba and threatened to bring more power failures to the island’s already fragile electricity system was largely controlled Wednesday after nearly five days, authorities said.

Flames that recently consumed the fourth tank in the eight-tank facility in Matanzas were almost quelled, although the third tank remained on fire and surrounded by smoke, officials said.

Col. Daniel Chávez, second in command of Cuba’s firefighting department, said the fire could keep burning for the next couple of days, but he did not expect it to spread further. He said the next step is to cool the area.

The blaze killed at least one person and injured 128 others, with 14 firefighters still reported missing and 20 people hospitalized. The fire also forced officials to evacuate more than 4,900 people and shut down a key thermoelectric plant after it ran out of water, raising concerns about a new round of blackouts in addition to the ones the government announced last week for Havana.