From Al-Qaeda Targets West from Horn of Africa:
The Horn now ranks alongside the Middle East as the area of greatest concern to British counter-terrorism officials, coming second only to Pakistan, where al-Qaeda’s core leaders are ensconced. Al-Qaeda operatives based in the Horn, probably in the failed state of Somalia, could choose to target Britain, which has a large Somali community. Of the four men convicted for the failed bomb attacks in London on 21 July 2005, all were from the Horn and two were of Somali origin.