Manchester suicide bomber Salman Abedi and his father, Ramadan, had long-standing links to a violent jihadist group which may have had British backing for the 2011 Libyan war and a 1996 attempt to kill then-Libyan leader Muammar Gaddafi.
The controversy centers on the role of the Libyan Islamic Fighting Group (LIFG), which was both an anti-Gaddafi and Al-Qaeda subsidiary in the North African state.
Rebels living in England have claimed the UK Government waived travel bans to let them fight Colonel Gaddafi in Libya as investigators probe the Manchester bomber’s visits to Tripoli.
Fighters which included Libyan exiles and British-Libyan residents have described how MI5 operated an open door policy for those willing to travel to North Africa to topple the dictator.
It comes as Home Secretary Amber Rudd admitted Salman Abedi, who killed 22 and injured at least 119 people when he blew himself up at Manchester Arena, was known to counter-terror authorities.