s ▁views ▁and ▁members ▁of ▁Britain ' s ▁Lib yan ▁di as por a ▁said ▁they ▁had ▁" warn ed ▁authorities ▁for ▁years " ▁about ▁Manchester ' s ▁Islam ist ▁radical isation . ▁Ab edi ▁was ▁alleg edly ▁reported ▁to ▁authorities ▁for ▁his ▁extrem ism ▁by ▁five ▁community ▁leaders ▁and ▁family ▁members ▁and ▁had ▁been ▁b anned ▁from ▁a ▁mos que ; ▁the ▁Chief ▁Const able ▁of ▁Gre ater ▁Manchester , ▁however , ▁said ▁Ab edi ▁was ▁not ▁known ▁to ▁the ▁Pre vent ▁anti - rad ical isation ▁programme . ▁ ▁On ▁ 2 9 ▁May ▁ 2 0 1 7 , ▁M I 5 ▁launched ▁an ▁internal ▁inqu iry ▁into ▁its ▁handling ▁of ▁the ▁warnings ▁it ▁had ▁received ▁about ▁Ab edi ▁and ▁a ▁second , ▁" more ▁in ▁depth " ▁inqu iry , ▁into ▁how ▁it ▁missed ▁the ▁danger . ▁The ▁Daily ▁Mail ▁reported ▁that ▁M I 5 ▁had ▁a ▁policy ▁of ▁allowing ▁Lib y ans ▁in ▁the ▁UK ▁to ▁travel ▁to ▁fight ▁against ▁G add af i ▁and ▁return ▁later , ▁including ▁some ▁who ▁had ▁been ▁under ▁house ▁arrest ▁in ▁the ▁UK ▁for ▁counter - ter ror ist ▁measures . ▁On ▁ 2 2 ▁November ▁ 2 0 1 8 , ▁the ▁Int elligence ▁and ▁Security ▁Committee ▁of ▁Parliament ▁published ▁a ▁report ▁which ▁said ▁that ▁M I 5 ▁had ▁acted ▁" to o ▁slowly " ▁in ▁its ▁deal ings ▁with ▁Ab edi . ▁The ▁committee ' s ▁report ▁noted ▁" What ▁we ▁can ▁say ▁is ▁that ▁there ▁were ▁a ▁number ▁of