Factbox-What is known about arrests at US airbase in Britain

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Five men have been arrested near RAF Fairford, a British airbase used by the United States for strikes on Iran. A local councillor said a specific threat against the base had been reported about six weeks earlier, prompting increased surveillance.

LONDON, Sept 28 (Reuters) - British police have arrested five men near an airbase used by the US for strikes on Iran. Below is what is known so far about the incident at RAF Fairford: SECURITY STEPPED UP RECENTLY A local councillor, Tristan Wilkinson, told Reuters there had been a specific threat about six weeks ago from the Iranians against the base in western England, leading to increased surveillance in the area.