We should follow the drones to see where they land, and continue the investigation from there.
There is no evidence that the drones carry WMDs, or that they're dangerous like Iran. If we had reason to believe that the drones are associated with WMDs, then it would be okay to neutralize them, but we don't. Because of false assertions about WMDs, we've already had one unnecessary war in Iraq. How many more do you want?