Counter-terrorism police defended their decision to bail five British men arrested over the incident, saying petrol but no explosive devices were found in the vans.
The University of Gloucestershire says a growing share of students starting courses are choosing to stay at home rather than move away.
Gloucestershire police evacuated homes and inspected several vehicles after a "major incident" was reported near a base used by the US Air Force.
Counter-terrorism police are leading the investigation after a bomb squad was deployed and extra security measures put in place at the Gloucestershire airbase.
Gloucestershire police announced the arrest of several men suspected of explosives-related offences, near a base used by the US Air Force.
Conservation group says beavers could help boost wildlife and manage drought as it searches for suitable habitats.