Thousands of people have been left without power in their homes following a second tornado to hit Oklahoma in the space of two weeks.
Around 50 people were injured in the storm, according to the Associated Press.
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Selena Gomez said she was taking time out to deal with panic attacks and depression thought to be a side effect of her lupus disease.
Temperatures will be highest in the southeast, reaching a high of 24 Celsius (75F) here.
Theresa May is to host a meeting at her country retreat Chequers to discuss plans for Brexit on Wednesday.