Major Hurricane Irma has been causing devastation in the Caribbean as it makes its way toward the United States. At least 21 people have died. US weather authorities say, the category-4 storm is moving west over the Caribbean Sea near the coast of Cuba. They say the hurricane is packing winds of up to 248 kilometers per hour.<br/><br/>Irma could make landfall on the southern US state of Florida and officials are urging people to evacuate. US media are reporting drivers are flocking to gas stations and highways are jammed. Irma is expected to move north after making landfall on Florida. Authorities in the adjacent state of Georgia are also calling on people to evacuate.