The international terror threat level to the UK has been reduced from severe to substantial, Home Secretary Theresa May said today.

Northern Ireland's First Minister has said the raising of the threat level to Britain from dissident republicans is "worrying".

The threat level to the UK from Irish-related terrorism has gone from moderate to substantial, meaning an attack is a “strong possibility”, British Home Secretary Theresa May said today.

The threat to the UK from international terrorism has been raised from substantial to severe – meaning an attack is “highly likely”.

The threat to the UK from international terrorism was tonight raised from substantial to severe – meaning an attack is “highly likely”.

Britain's terrorist threat level has been downgraded from “severe” to “substantial”, Home Secretary Alan Johnson said today.

Some of the suspects arrested in connection with the terror plots in London and Glasgow were known to MI5 before the attacks took place, it has emerged.

EMAIL alerts warning of any increase in the terrorist threat will be sent out to members under a new system launched by the MI5 security service.

Police have foiled a major plot to blow up aeroplanes in mid-flight, British Home Secretary John Reid said today.