this instance in sydney? i know it's early yet. but that american intelligence officials or national security officials can say, this is what we do to prevent it from happening here? >> we have to look at the pattern of attacks that have isis inspiration this year. if you count the beheading in oklahoma, that's six of them. in general, there's about -- over the past daeecade, there he been about seven attacks for lone wolf attacks. this year, there's been six. one lesson is that social media, in my view, is effective in taking that group function which normally exists in terrorism -- that is, people egging each other on and it can apply to lone wolfs. my concern and what law enforcement have in mind is the pattern of lone wolfs and the pace of them may be increasing. >> thank you both so much. coming up, back here in the