A boy aged 11 has been jailed for 11 years for possession of Christopher Barry . He stabbed Mr Barry , a policeman , twice in ' cowardly and violent ' attack . Teenager was a member of the notorious Wood Green Gang in 1979 . Boy was thrown out of prison at 11 for possessing firearms and a knife .
A boy aged 13 has been jailed for 11 years for murder of Christopher Barry . He stabbed Mr Barry , a builder , twice in 'cowardly and unprovoked ' attack . Teenager was a member of the notorious Wood Green Gang in London . Boy was thrown out of school at 11 for possessing cannabis and a knife .