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An island-wide blackout plunged Cuba into darkness Monday as the country’s deepening energy crisis continues to strain its fragile power system.

The outage affected roughly 10 million people before limited electricity service was restored in some areas.

"A total disconnection of the National Electric Power System is occurring," Cuba’s state-run Electric Union said Monday morning. "The causes are being investigated."

Cuba has faced increasingly frequent power outages in recent years as the country struggles with chronic fuel shortages and deteriorating electrical grids. The crisis worsened when President Donald Trump imposed additional sanctions in January and threatened tariffs on countries that provide oil to the island.

During Monday’s blackout, public transportation was largely halted, and officials said tens of thousands of surgeries were canceled nationwide, according to The Associated Press (AP).

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Authorities later said one generating unit had resumed operations roughly two hours after the collapse.

"Microsystems are already operational throughout the country, to ensure protection for vital services," the Electric Union said.