A police officer blocks a road near the RAF Fairford airbase, in Fairford — Toby Shepheard
    
  
    
    
  
  
          

            LONDON, Sept 27 (Reuters) - British police said counter-terrorism officers were leading efforts to establish what had happened at an airbase used by the US Air Force on Sunday, after they arrested five men on suspicion of preparing a terrorist act.The five men were also arrested on suspicion of committing offences under the Explosives Act.  (Reporting by Kate Holton; Editing by Alexandra Hudson)
      
              


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