Death toll may rise after tornadoes in southern US

Three days of severe spring storms have killed 24 people in the southern US, with the death toll expected to rise.

The latest storms saw four deaths reported in North Carolina, and the state governor warned of more to come.

Storm chasers have tracked tornadoes across the south, and Washington DC, Virginia and Maryland were put under tornado watch.

Governor of North Carolina Beverly Purdue said that the storms were "the most widespread tornadoes we've seen since the mid-80s".