Gordon Fielden, the London Regional chairman of the Fire Brigades Union, has been speaking to ITV about the reasons behind the three-year campaign of industrial action the union has been involved in.
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The 52-year-old had previous convictions for violence but was not on the anti-terror watchlist.
In a statement Charlton Athletic said: Keith was a true hero who will be greatly missed by all the Charlton family and everyone at the club.
London and the worlds has united on Twitter in defiance of the West minster attack #prayforlondon #wearenotafraid