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MI5Directorate of Military Intelligence, Section 5 (UK)
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Two men were detained on 28 November following an operation involving MI5 investigators and counter-terrorism police officers from Scotland Yard and the West Midlands.
A source had told Reuters last week that Abedi was one of "a larger pool of former subjects of interest" whose risk remained subject to review by MI5 and its partners.
MI5 have around 4,000 staff who are only able to keep tabs on 3,000 suspects, which is how Manchester bomber Salman Abedi, 22, fell through the net.
It was "a great acknowledgement of the continued progress we have made," MI5 Director General Andrew Parker reportedly said, adding: "Diversity is vital for MI5, not just because it's right that we represent the communities we serve, but because we rely on the skills of the most talented people whoever they are, and wherever they may be.
BOBBY WATERHOUSE Paul Ritter is the arrogant head of counter espionage at MI5.
A judge this month refused to strike out the claim at the request of MI5, which said it would neither confirm nor deny the allegations, in line with procedure.
After they were sent back to the UK, they were interviewed by MI5 officers who, they say, falsely accused them of links to Islamic extremism.
But along with the letter Mr Parker sent each pupil an official ballpoint in MI5 turquoise.
MI5 spymaster Andrew Parker was so touched by the letters from the 40 pupils that he sent an unprecedented personal response.
As part of the campaign, MI5 has set up an online quiz game, voiced by a female language analyst with a Brummie accent.