Cuba's electrical grid collapsed again on Sunday, the fourth such failure in 48 hours, with a hurricane making landfall to compound the island's misery and threaten further havoc on its decrepit infrastructure.

Cuba is suspending nonessential activities and school for the next three days as its fends off the twin threats of a grinding national blackout and Hurricane Oscar.

Hurricane Oscar made landfall Sunday evening on the northern coast of east Cuba before it weakened to a tropical storm as it moved across the island, according to the National Hurricane Center.