U.K. police arrested two Latvian men for trespassing into a Royal Air Force base, at a time of heightened tensions following a suspected bombing plot last week.

The two men were arrested after a security patrol at RAF Molesworth in Cambridgeshire came across an abandoned vehicle on Wednesday night, prompting a search that discovered a breach in the perimeter fence and then the men inside the base’s perimeter. They were arrested on suspicion of trespassing on a prohibited site and criminal damage, but their charges have since been upgraded to entering a prohibited place for a purpose prejudicial to the United Kingdom, under the National Security Act 2023.

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