Even by the stated terms of their own policy, the shooting should have been subject to direct intelligence. There are real questions to be answered here. Like who did they think this man was and what reason did they have for thinking he was a potential bomber? "Running away from plain clothes police" and "being a darkie with a big coat" are not good enough reasons to justify assassination by the state.
Not to be paranoid but I can see the threat of suicide bombers being used as an excuse for racial profiling, the kind of which was rampant in the USA after 9/11. Generally I think the British public haven't been as reactionary as the Americans were [but then they lost 3,000 and the rescue operation went on for days] however I have actually talked to people who believe it's sensible to view every "Arab male" as a suspect in order to protect everyone else. Despite half of these guys being African, for one thing [and i think all of them British citizens].
Link to more info on the vigil, plus a flyer:
http://www.indymedia.org.uk/en/2005/07/319820.html