INVESTIGATIONS into the collapse of a temporary grandstand in Lincolnshire in August were this week focusing on whether it could have slipped off timber blocks supporting its base.
Sources close to the investigation suspect the stand at Lincolnshire Showground may have slipped forward as the crowd began to move during a concert.
A section of seating collapsed on 29 August during a Christian festival (NCE 2 September).
Health & Safety Executive investigators and vibration experts from consultant Atkins are helping West Lindsey District Council with the investigations.
Some 21 people were treated in hospital after part of the 800 capacity stand gave way. They had been sitting or standing on a proprietary seating system, set up on grass, with timber pads underneath the stand's feet.
A council spokeswoman said parts of the failed structure had been removed from the wreckage to assess its reaction to vibration.
Investigators are examining video footage to gauge the extent of the crowd's activities.