GM protesters sit in front of police line in Harpenden

The 'Take the Flour Back' campaign group protesting GM wheat trials in Harpenden, Hertfordshire. Credit: Martha Fairlie

Protestors have advanced towards the police line.

They are nowsitting in front of the police.

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GM wheat trial protests

Hundreds of protesters have gathered near a scientific research centre where a genetically modified wheat crop is being grown. Security around the site in Harpenden, Hertfordshire, has been increased.