Millions of people in Florida and South Carolina are set to be evacuated as Hurricane Matthew heads towards the US.

The powerful Category 4 storm has already left a path of destruction across the Caribbean, killing at least 11 people.

Winds of up to 145 miles-an-hour slammed into parts of Haiti and the Dominican Republic.

Forecaster with Met Eireann Gerry Murphy says the storm is likely to weaken as it moves north: