Jefferson County Sheriff's Office Deputy Rod Carroll has praised drivers involved in the Interstate 10 crash in Texas for assisting the emergency services.
"It's just people helping people," Carroll told KFDM "The foremost thing in this holiday season is how other travellers were helping us when we were overwhelmed, sitting and holding, putting pressure on people that were injured."
More top news
The singer, 31, said on Twitter that she and her partner Jonathan Powell were grieving their loss.
A fine evening ahead to the south with some late sunshine in places.
Prince Charles and the Duchess of Cornwall have visited Manchester Arena, the site of a suicide bombing in May which left 22 people dead.