South Yorkshire Fire and Rescue Group Manager Andy Hayter told ITV News Calendar the Asos warehouse blaze near Barnsley was probably caused deliberately, though investigations are still ongoing.
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Heavy rain continues across southern Scotland/northern England and the southwest.
Staff at the hospital treating critically-ill baby Charlie Gard have received "shocking" abuse including death threats over the case.
The actor, best known for his role as the dad in Home Alone, was found dead on Friday in his hotel room in Palo Alto, California.