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Cuba has been plunged into darkness after the country's national power grid collapsed, leaving millions without electricity in the latest blow to the island's deepening economic crisis. Grid operator UNE said it was investigating the cause of the nationwide blackout. The blackout comes amid heightened tensions between Havana and Washington. Since January, Cuba has been under a harsh energy and financial embargo imposed by the United States, effectively blocking Havana off from fuel, it's main energy source, and the deepening the crisis had already been deteriorating for the past five years.