I'm not a professional trader by any means, but I would regard all of these spikes as important seismic activity. On the few occasions I've done options trading, I've looked at level 2 data for peaks just like this. It's just another data point meaning there might be significant movement, but nothing is certain. In this case, I would pull up the calendar of Jewish holidays. Is it nearly Passover - that holiday where the angel of Death went door-to-door? Well, that's a big indicator to me that there could be a terrorist event. The April spike definitely makes sense in that context, along with Egypt's warnings. Oct. 6th-8th is another holiday, not as big. Holidays mean people will be out celebrating in large groups.

All of it combined lends itself to algorithmic early detection systems. The general public should have this security. Not a sure thing, but neither is meteorology.