The younger brother of Manchester suicide bomber Salman Abedi was planning an attack on a United Nations special envoy.
Reports claim Hashem Abedi, 20, had plotted to assassinate Martin Kobler, the head of the UN Support Mission in Libya, during a visit to Tripoli earlier this year.
The terrorist cell were thought to be in the later stages of the plan, but it was foiled before it could be executed.
The Islamic extremist group had been monitored for some months by Libyan security services who believe the younger Abedi brother is a ‘significant player, reports the Telegraph.
He was arrested at the Abedi family home in Tripoli on Tuesday and is being interrogated by MI6 and Libyan intelligence over his role in the Manchester Arena bombing last Monday.
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