At least six people had to be rescued from a block of flats in Crawley after a fire in a stairwell trapped them inside the building.
Fire investigation officers from West Sussex Fire and Rescue Service are looking into the cause of the blaze.
Six fire crews went to the flats in Broadfield Place in Crawley after they received two calls from residents in the building just after 7am today, 27th November 2012.
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The 22 year old man is seriously injured in hospital. Police believe a baseball bat and iron bar may have been used in the attack