Had an "incident" not long ago with 2 pax on our rest break changeover. I elevated it to the proper authorities via SATCOM. I don't trust anything these days. The leader of AQAP recently posted several videos online stating they are actively targeting. I'll leave it at that. Follow your procedures and if doesn't look right , or smell right, or you have that gut feeling about it, then do something. Still a threat out there and they are not stopping. Stay vigilant, follow procedure and trust your instincts.