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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Police have raided another address in Moss Side as they investigate the Manchester Arena attack.
A band of heavy, thundery showers moves in from northern France this afternoon.
Armed police were out in force as runners competed in the largest public event in the city since Monday's terror attack.