The US government is preparing to issue a warning to Americans in Europe about the threat of terrorist attacks, according to reports.
British intelligence services recently disrupted a plot to launch Mumbai-style terrorist operations in major European cities, while French police evacuated the Eiffel Tower on Tuesday following a bomb threat.
The two incidents, together with intelligence from their own security services, have prompted US State Department officials to reconsider the level of threat posed by al-Qaeda in Europe.
It is yet to make any formal statement about the matter, but reports suggest secretary of state Hillary Clinton plans to issue new travel advice to US citizens in the next few days.
She is not expected to recommend that Americans stop travelling to Europe, but will advise them to be more vigilant at transport hubs and when visiting popular tourist destinations.
British officials are also monitoring the latest intelligence reports on al-Qaeda plots, but the Home Office has no plans to raise the official threat level from its current status of 'severe'.
The news comes as two former SAS officers warned that the UK is not equipped to cope with an attack similar to the one that left 174 people dead in Mumbai in 2008.
Writing in the Sunday Telegraph, Colonel Richard Williams and Lieutenant General Sir Graeme Lamb said a commando-style raid on a major London office complex could develop into '9/11 in slow motion', with police unable to stop terrorists murdering workers trapped in the building.
They added: 'This would temporarily create a war zone within London and one that cannot effectively be countered by the police alone. The police are good at policing but we doubt they would want to try war fighting.'
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