Hundreds of people have staged a protest in Trafalgar Square against changes to the benefits system.
The so called bedroom tax, which is due to be introduced next month, would see welfare payments deducted from households judged to have extra rooms.
The changes mean that around 80,000 will lose an average of £771 each.
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Omid Saidy, 20, was knifed to death after asking a drug dealer and another man to leave the area, police say.