According to this graphic:

http://news.bbc.co.uk/1/hi/uk/4706787.stm#graphic

The man was challenged i.e "stop or I fire" kind of instruction, to which man refused to comply.

That is at least some reassurance, however the question remains unanswered by the autorities, at this time, as to why he had to be shot 5 times at point blank range.