Cuba's efforts to restore power to the island were derailed for a third time late on Saturday, Cuban authorities said shortly before midnight, leaving millions in the dark and raising fresh questions over the viability of the government's bid to reestablish electrical service.

Cuba’s government reports it has made progress in re-establishing electrical service to parts of the island, which remains mostly shrouded in darkness. Parts of the capital Havana and some hospitals have had their electricity restored after the national grid collapsed twice in a span of 24 hours,