Florida has ordered 5.6 million people to evacuate as massive Hurricane Irma menaces the southeastern US state, according to its Division of Emergency Management.

Irma regained strength as a Category 5 storm late Friday as it made landfall on the Camaguey Archipelago of Cuba, and is now swirling about 275 miles (440 kilometers) away from Miami packing maximum sustained winds of 160 miles per hour.

Irma is expected to strike the Florida Keys late Saturday and Sunday before moving inland, according to the National Hurricane Center, and many residents have joined a mass exodus amid increasingly dire warnings to leave