Multiple road closures and searches of suspect vehicles looking for that hallmark muti-pronged AQ MO will be playing havoc with the Friday rush hour traffic building up now (London is 5 hours ahead of EST/EDT).
I hope the terrorists do not have other assets in place.
I still think an attack tonight would have been more effective (Tiger Tiger was not full last night, but they are often at, or past, capacity on the weekend)
With CCTV; there should be a good chance to identify who was involved!
And that will in turn alert people; the cameras have worked well in this aspect and I would not mind giving up my privacy for this reason.