AdamG,

Leaving aside the reporting so far I did wonder why the murder and attacks on others took place so close to the location so close to Russell Square. Where a London red double-decker bus was blown apart; the image became 'the' iconic image of the 7/7 bombings in 2005:

Earlier in the day the Met Police (with Mayor Sadiq Khan) did a major PR show, on the increased numbers of armed police on patrol in London, in particular the specialist CT officers. It was the lead news item here and by the late evening had gone from the screens:http://www.bbc.co.uk/news/uk-36961338