UK spy agencies knew about soldier's killers LONDON: British police made two further arrests on Thursday and raided houses across London following the brutal murder of serving soldier who survived a tour of duty in Afghanistan. Prime Minister David Cameron appealed for calm after 25-year-old Lee Rigby was butchered outside London army barracks on Wednesday while an extra 1,200 officers were deployed on the capital's streets in bid to reassure the public Intelligence agencies meanwhile came under scrutiny after it emerged the two murder suspects, who were injured in police gunfire at the scene, had been known to the security services,