read on cai yun's weibo (chinese twitter) that the organisers will be meeting the team representatives to decide if the tournament should continue.
Oh, London is safe ..... as long as you stay Underground, and out of football stadiums during matches.
So long it is not footie related, it should be fine in Ldn. The Olympics should be fairly safe too except for soccer, win or lose (there shall be some form of celebration/destruction).