Two people have reportedly been killed after several tornadoes ripped through states in the southern and central United States.
The deaths were reported in the Oklahoma town of Quapaw, while officials in Arkansas have also spoken of "mass casualties" near the city of Little Rock.
More top news
The Duchess of Cambridge has been on maternity leave since the week before Easter.
The Duke and Duchess of Cambrige have been together for 15 years and will have three children under the age of four.
News of William and Kate’s third child was announced on September 4 and the duchess went on maternity leave on March 22.