Two Latvian men arrested inside RAF Molesworth, a Cambridgeshire base used by US and Nato forces for intelligence operations, have been released on bail.
Police arrested the men, aged 32 and 26, at 2am on Thursday after discovering them inside the base. Both were freed on strict conditions while the investigation continues.
RAF Molesworth hosts US military and Nato personnel conducting intelligence work. The circumstances of how the men entered the base or their purpose for being there are not detailed in the available information.