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Large parts of Cu­ba were with­out pow­er on Tues­day af­ter its third black­out in four months un­der­scored the is­land’s deep­en­ing en­er­gy and eco­nom­ic crises and ris­ing po­lit­i­cal ten­sions with U.S. Pres­i­dent Don­ald Trump.

Elec­tric­i­ty was slow­ly be­ing re­stored to hos­pi­tals and some of the is­land’s 11 mil­lion res­i­dents, but of­fi­cials warned that its crum­bling pow­er net­work could fail again.

Cu­ba’s ag­ing grid has dras­ti­cal­ly erod­ed in re­cent years, lead­ing to dai­ly out­ages and an in­crease in sig­nif­i­cant black­outs.