Eight people were arrested after they chained themselves together as part of a protest at a nuclear weapons factory.
AWE is the headquarters of Britain's nuclear development programme
The Atomic Weapons Establishment (AWE) site at Aldermaston, Berks, has been the scene of several protests recently.
Five men and three women were arrested on the A340 on suspicion of unlawful obstruction of the highway.
Campaigners are angry at the government's decision to give the go-ahead to a new system to replace Britain's existing Trident submarines.
Thames Valley Police said all eight were in custody.