Two men, aged 36 and 32, were arrested inside the base perimeter of RAF Molesworth on Tuesday.
Both men are Latvian nationals, currently resident in the UK.
Ministry of Defence Police (MDP) carrying out security patrols at RAF Molesworth identified an abandoned vehicle.
Police from Cambridgeshire Constabulary also attended and, working with colleagues from MDP, carried out further searches around the site.
A small breach of the perimeter fence was subsequently identified and at approximately 2am on 8 October, two men were found and arrested.
They were initially arrested on suspicion of trespass on a prohibited site and criminal damage and taken to a Cambridgeshire police station.
The pair have since been further arrested on suspicion of an offence under section 4 of the National Security Act 2023 – namely entering a prohibited place for a purpose prejudicial to the UK. Both men currently remain in police custody at this time.
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