The image below show the number of hot food takeaways around secondary school in Newham. The red triangles indicate the location of secondary schools. The dark areas show the highest densities of fast food outlets.
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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