The Prime Minister is meeting young people at the Luta Pela Paz ('Fight For Peace') project which aims to turn youngsters away from drugs and crime through sport - especially boxing.
Just before, he took a brief tour of the Mare Favela north of Rio De Janeiro with project director Luke Dowdney. Many of Brazil favelas or shanty towns, including this one, are outside of police control.
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Read the letter carefully, don't worry, it's short. Note that while it praises the Conservative-led government it does not mention Labour.