Michael Adebolajo 's brother says committee is trying to justify new spying legislation . Intelligence firms must live up to duty to prevent spying , UK PM David Cameron says . `` However , the problem is acute : until it is resolved the British public are exposed to a higher level of threat , '' he said . UK : UK intelligence , security agencies could not have stopped Lee Rigby 's slaying . But UK chairman slams intelligence companies for not flagging one exchange .
Michael Adebolajo 's brother says committee is trying to justify new spying legislation . Intelligence firms must live up to duty to prevent spying , UK PM David Cameron says . UK : UK intelligence , security agencies could not have stopped Lee Rigby 's slaying . But UK chairman slams intelligence companies for not flagging one exchange .