Well, drones, of course, and they do have them. But somebody has to go out there and engage these guys if they decide to turn up and lob stuff your way. In terms of state sponsors, one of the mortar bombs that hit my camp in Egypt didn't explode, so we could see that the tail fins on it were triangular. That meant it was of Iranian manufacture. So we know these guys are being supported by outside agencies. The proof is in the pudding, so to speak.
On April 24th, 2018. See this statement in context.