Hurricane Dorian grew and picked up speed, churning on a path that forecasters said would come "dangerously close" to Florida later on Tuesday after the storm battered the northern Bahamas, killing at least five people.

Dorian over the weekend was one of the most powerful Atlantic hurricanes on record, pulverizing buildings and flooding parts of the Abaco Islands in the northern Bahamas.

On the U.S. East Coast, more than a million people have been ordered evacuated ahead of its expected advance.