Security has been increased around a farm in Hertfordshire where Genetically Modified wheat is being grown.
Campaigners planning to protest about the potential dangers of the experimental crops are being kept away from the crop at the Rothamsted Research centre.
Anti GM group "Take the Flour Back" is worried about contamination to the surrounding area. Rothamsted Research says the possibility of contamination from pollen blown in the wind is small.
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Flights were temporarily suspended on Tuesday evening after the group entered a secure area and erected a blockade near a runway.
The pathologist described the injuries as similar to those usually seen in a car crash.
Unlike in the countryside peregrines have no predators in the city and their numbers are on the rise.