Two men who were re-arrested as part of an investigation into a suspected terror plot near RAF Fairford can be held for up to seven days after police were given more time to question them.
A warrant of further detention was granted for the two men at Westminster Magistrates' Court on Wednesday, Counter Terrorism Policing (CTP) said.
It means the 24-year-old UK national and 25-year-old dual UK-Iranian national can be held without charge until 27 October.
The two men, both from the borough of Westminster, London, were re-arrested on Tuesday on suspicion of assisting a foreign intelligence service.
Police said it was "highly likely that there is Iranian state involvement" after three large vans were stopped near the airbase in the early hours of 27 September.
The 24-year-old man was initially arrested that day near RAF Fairford and the 25-year-old was later arrested on 1 October in Westminster, central London.
Five other UK nationals in their mid-20s were also arrested after the incident. All are still on police bail as the investigation continues.
Assistant commissioner Laurence Taylor, head of national counter terrorism policing in the UK, said: "This is very much a live investigation, and our evidence gathering continues, but at this time our position remains the same; we consider it highly likely that there is Iranian state involvement.
"Our investigators are continuing to examine what that level of involvement was and the ambition behind it."
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He added: "We know the public have unanswered questions. I want to be as transparent as possible and when we are in the position to share more, we will."
Earlier this month, the US removed its bombers from RAF Fairford, partly because of a reported threat of a possible Iranian drone attack, American officials told Sky News' US partner network NBC.
US President Donald Trump later told reporters outside the White House that "threats" led to the decision to remove the US bombers, including B-1s, B-2s and B-52s.
However, a spokesperson for Prime Minister Andy Burnham insisted the RAF base remains secure after the US military withdrew its strategic bombers over their security concerns.
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