Scottish Natural Heritage have released a statement to ITV Border describing the risk of crayfish transfer to silage bales as "very small."
"It is the first time that we have come across reports of signal crayfish being transported in silage bales.
"Although it's feasible that crayfish might get caught up in the bales the risks of transfer of live crayfish between river catchments is very small."
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Cumbria Police say many of the knives were kitchen or trade knives, but there were also some "antique and dangerous weapons".