I'm no genius but one Apache should do the trick ;)
True on all accounts, the Apache remark was a joke like the other anon said,seriously though, this is why we need a wall,and surveillance it 24/7, I would send a couple of Predator Drones and keep an eye on it if true.If it is true also,perhaps this little ride is intended to open peoples eyes a little, maybe a little back strategy for the masses.