Two Latvian men were arrested after a fence was breached at an RAF base used by the US military and Nato for intelligence operations, counter-terrorism police have said.
The alert was raised when a Ministry of Defence Police (MDP) security patrol at RAF Molesworth identified an abandoned vehicle at about 22:00 BST on Wednesday.
Searches revealed a small breach of the fence at the site in Cambridgeshire, and a few hours later, police said the pair were arrested inside the perimeter.
The two men are aged 36 and 32 and live in the UK, the Met Police said.
The force’s Counter Terrorism Policing London is investigating and commander Helen Flanagan said officers were not currently linking it to the high-profile incident in Gloucestershire.
“We’re very aware of the recent heightened interest and concern around military sites, but at this stage there is nothing to suggest this incident is connected to the events at RAF Fairford last week,” said Flanagan.
However, she stressed the inquiry was in its “very early stages”.
They were initially arrested on suspicion of trespass on a prohibited site and criminal damage – after Cambridgeshire Police officers joined the search – and were taken to a local station.
The pair were later arrested on suspicion of an offence under Section 4 of the National Security Act 2023, external – namely entering a prohibited place for a purpose prejudicial to the UK.
RAF Molesworth is home to the US’s intelligence operations centres for Europe and Africa, as well as a Nato intelligence hub.
It is not used as a flying station.