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Det Ch Insp Matt Gillooly, from Hampshire and Isle of Wight Constabulary, said: "We want to reassure you that this appears to be an isolated incident on board, and we want to thank the crew for their cooperation and assistance with our inquiries."

Ch Supt Steve Dodds, Leeds District Commander, said this would continue over the coming days "both on the streets and around key events in the community".

Det Ch Insp Louise Jenkins said it was an "extremely tragic incident where a boy has sadly lost his life".

Ch Supt Ben Clark, of Thames Valley Police, said there was "no doubt" that Mugambe had known she was committing offences.

Ch Insp David Mather said: "This is a tragic discovery and our thoughts are with this boy's family and friends at this incredibly difficult time."