Protestors planning action over a genetically modified wheat trial in Hertfordshire have been banned from going anywhere near the crop.
A group called Take The Flour Back had planned a day of protests at Rothamsted Research in Harpenden.
But St Albans council has won an order from the Home Office to use extra police powers to stop them going on to the land, amid fears the demonstration could result in damage to crops and buildings.
Supporters are due to congregate in Rothamsted Park, next to the institute, at noon.
The plan was to proceed along footpaths to a site where scientists are growing a new strain of experimental wheat.
Take The Flour Back hopes "hundreds" of activists will answer the rallying call.
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