Yemen has now replaced Iraq as al-Qaeda's main base in the Middle East. That is the belief of senior western intelligence officials. Last Saturday for example, in a bold daylight raid, militants attacked the security HQ in Aden freeing a number of Al-Qaida operatives. The BBC's Frank Gardner reports on a hidden war. Mohamed Taha Mustafa, Yemen's Ambassador to the UK, says US and Europe should work together with Yemen rather then sending drones.

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