Paul Emery is the Regional Secretary of the Fire Brigades Union
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Munir Mohammed enlisted pharmacist Rowaida El-Hassan to advise on chemicals for a bomb after they met on dating website SingleMuslim.com.
The collection includes hundreds of items of refugee clothing found mainly on beaches of Lesbos and garments left behind in Calais.
Police say they are treating the package which contained a substance, believed to be addressed to Harry and Meghan, as a racist hate crime.