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UK Prime Minister Andy Burnham told Parliament that Iran's Revolutionary Guards Corps were 'almost certainly' behind threatening activity at RAF Fairford, an airbase used by US forces, marking the firmest attribution yet after more than two weeks of investigation. The UK said it would impose further sanctions on Tehran and the IRGC in response, a move highlighted in MI5's annual threat assessment naming Iran alongside Russia and far-right extremism as a top security concern for Britain. Iran's Foreign Ministry spokesperson Esmaeil Baqaei rejected the accusations, saying Britain cannot conceal its 'destructive role' in regional instability by deflecting blame.