Carty and Brown was , according to Brown , childhood friends who thought of each other as cousins . Carty lived with his grandparents in Burrows Road , Kensal Green , and Brown lived with his mother in Rosebank Avenue , Sudbury , northwest London . Carty had one conviction for assaulting a police officer when he was 16 years old , and a caution for possessing cannabis . Brown had no previous convictions . The pair was members of a violent gang calling itself the KG Tribe , taking part in the unlawful wounding of two commuters in December 2005 as well as other robberies . At the time of the murder of Pryce , Carty and Brown was 18 and 17 respectively .