The brother of Moors Murders victim John Kilbride has said that Ian Brady should be "kept alive until he tells where Keith Bennett's body is".
Speaking to BBC Radio 5 Live, Terry Kilbride said: "If he does take it to the grave it's gonna be a real sad ending for the Bennett family".
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The Ukip leader confirmed he had "no prior warning" of Douglas Carswell's resignation from the party as he hit out at the "staunch Tory".
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.
The violence began after a counter-protester allegedly doused a female rally organiser with pepper spray.