Two Latvian men living in the United Kingdom, aged 32 and 26, were arrested at about 2 a.m. Thursday after being found inside RAF Molesworth, in Cambridgeshire, which hosts the Intelligence Fusion Centre of the North Atlantic Treaty Organization (NATO) and the US Joint Intelligence Operations Center, Europe, according to The Guardian.

The investigation began four hours earlier, when military police found an abandoned vehicle near the facility, and police later found a small hole in the perimeter fence, according to The Hindu. The men were initially arrested on suspicion of trespass on a prohibited site and causing criminal damage, then 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, and were later released on bail, with strict conditions, while the investigation continues.