LondonA 22-year-old is the 7th arrested over RAF Fairford.
Police arrested him on suspicion of preparation of terrorist acts near a base hosting US warplanes.
He is linked to the 27 September incident, when three vans carrying gasoline were stopped but no explosives were found.
Iran denies involvement, and all six earlier suspects have been released on bail.
Prime Minister Andy Burnham cites strong indications of Iranian involvement but has given no details.
How each outlet framed it
drawn from 150+ reports worldwide
- Al Jazeera Online
- ABP Live
- identifies gasoline-filled vans (no explosives), dual UK-Iranian suspect; base authorized for 'defensive operations into Iran'
Sources: Al Jazeera Online, ABP Live