UK travellers warned over Europe terror threat
The Foreign Office has updated its travel advice for Europe, warning of a "high threat" of attacks in countries including France and Germany.
Previously it had advised only of a "general threat" but an FCO spokeswoman said the safety of Britons abroad was of major concern.
The US has also advised vigilance in Europe because of the threat of an unspecific al-Qaeda attack.
The UK's threat level, as set by the Home Office, remains severe.
Frank Gardner reports.