Two mothers whose sons were stabbed to death in the same year have taken their campaign for peace to a school in East London.
Jimmy Mizzen and David Idowu were both murdered in 2008.
Their mothers have spent 100 days touring the capital speaking to young people about avoiding violent confrontations.
Their project will end with a concert on Sunday.
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The lifeboat crew carried the pair into their boat and dropped them off back at Tower Bridge as people watched from the riverside.
The huge painting took two graffiti artists thousands of hours to complete in east London.