Watch: What we know about the counter-terrorism operation near RAF base

Five men have been arrested and remain in custory, as counter-terror police lead an investigation at a major incident near RAF Fairford.

Gloucestershre Police say they received a call at about 00:45 BST relating to "three suspicious vehicles" travelling towards the base.

Residents in Whelford, a nearby village, have been evacuated and taken to a leisure centre while investigations continue.

The BBC's Duncan Kennedy is at the base, which the US Air Force have used to to launch attacks on Iran since March.