LONDON, Ky. — Forecasters warned Monday that more tornadoes and storms were possible in the central U.S. as people from Texas to Kentucky cleaned up from severe weather that has killed more than two dozen people in four days.

In St. Louis, where officials estimated a tornado Friday damaged 5,000 buildings and may cost well over $1 billion, the mayor warned Monday that federal assistance could take weeks.

Kentucky has been hardest hit by the storms. A devastating tornado late Friday into early Saturday damaged hundreds of homes, tossed vehicles, left many homeless, and killed at least 19 people, most of them in southeastern Laurel County.

In London where the devastation was centered, the small airport became a beehive of cleanup work after it took a direct hit from a tornado. Officials were using it as a base to get water, food, diapers and other supplies out to the community. Tornadoes could be possible in an area centered in eastern Oklahoma on Monday with the risk of severe storms moving into Alabama, Mississippi and Tennessee on Tuesday, according to the National Weather Service.

— The Associated Press