Cuba's power grid collapsed on Sunday evening for the fourth time in two days, plunging much of the island nation into darkness as Hurricane Oscar made landfall in eastern Cuba as a Category 1 storm.

Cuban President Miguel Diaz-Canel confirmed the preliminary death toll after Oscar made landfall as a Category 1 hurricane but provided no details of how the deaths had occurred.

Tropical Storm Oscar was heading toward the Bahamas late Monday after dumping heavy rain across eastern Cuba. A tropical storm warning was in effect for the central and southeastern Bahamas.