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25 May 2017, 11:44 | Updated: 25 May 2017, 11:46
Soldiers have been stationed outside AWE Aldermaston and Burghfield, where Britain's nuclear deterrent - Trident - is maintained.
Bosses say it's just a precuation in the wake of the increased terror threat.
Here's their statement:
"Following the terrible events in Manchester on Monday, our thoughts are with the families and communities of everyone affected by this tragedy.
"Across the UK, as part of Operation Temperer, a number of Army units have been mobilised to support the police and some Army personnel have arrived at AWE (Burghfield and Aldermaston).
"This is a precautionary measure so that if the on-site police are requested to deploy officers away from AWE, in support of national security, the Army will step into those roles.
"Army personnel will only be used in roles for which they are already suitably trained, and neither safety nor security at AWE will be compromised at any time.
"Please continue to be vigilant and aware."