Dozens of firefighters from across Norfolk spent several hours tackling a large blaze in former offices in Norwich.
Firefighters from Wroxham, Acle, Sprowston, Hethersett, Earlham, Long Stratton, Loddon, Wymondham, Fakenham, Aylsham, Gorleston, Great Yarmouth, Thetford, Dereham, Attleborough, Hingham, King's Lynn, Reepham and North Walsham plus the aerial ladder platform, control unit, drone and water carrier were called to the old May Gurney site at Trowse, at about 11pm on Saturday.
They wore breathing apparatus as they doused the flames.
The site has been broken into on several occasions since becoming derelict and there have been concerns about security.
It is due to be redeveloped as part of a major scheme including riverside retail and dining area and 670 homes.
The May Gurney and Deal Ground sites in Trowse are abandoned and disused, with dilapidated buildings still standing in the former industrial area.
The site was earmarked for development in the East Norwich Masterplan and outline planning was approved in 2013.
But the works have proved controversial among people living in the area - with many raising concerns about traffic chaos and flooding.
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