If I knew for sure a terrorist attack was about to happen, I'd do something like, I don't know, contact the police. I certainly wouldn't make a video about it and distribute it over the Internet.

Let's wait until the end of October and see if this really does happen. For some reason I'm reminded of all the psychics who "predict" on every New Year's Day all sorts of major events that will happen over the year but aren't actually called to task at the end of December to see how correct they were.