by an american who goes -- went by the name jihad joe who carried out a suicide bombing in syria and he looked at that video and said he was inspired to do exactly that here in the united states. >> very disturbing information. evan, thanks very much for that report. stay with us. i want to bring in our chief national security correspondent jim sciutto. jim, this is the 21st isis related arrest here in the united states since the start of this year only two days ago madison, wisconsin man was arrested after flying to turkey to attempt to fight for isis. does this number reflect the growing threat isis poses to the united states? because we have heard from a lot of top u.s. homeland security officials, they are pretty alarmed right now. >> reporter: it reflects two things. one, it does reflect the draw of isis not just in the u.s. but in other western countries. it's something that u.s. counter terror officials have consistently told me if not the most capability in terms of attack it's the most likely