London.
On April 30, 2003 two British, middle-class citizens of Pakistani heritage walked into Mike's Place, a nightclub in Israel's capital, Tel Aviv. One of them detonated a bomb killing himself and three others. This appears to have been the first suicide mission carried out by a western citizen motivated by al-Qaeda's ideology.
While neither of the Britons had trained in an al-Qaeda training camp in Afghanistan, both had attended meetings of the London-based al-Muhajiroun, effectively an al-Qaeda support group.