"It's too dangerous to go in at the minute, so we're carrying out fire investigation using other means talking to witnesses, interrogating systems that are functioning within the building, so the fire alarm, CCTV etc."
More top news
Town's Championship game with Brighton part of a busy night for the region's League football clubs
A mix of patchy cloud and clear spells tonight. Bright and warm tomorrow
An animal charity has warned that 700 stray dogs in the Anglia region faced destruction because microchip details were out of date.