The Marquis should put up concrete barriers immediately and ban all cars from the lower level. Those Pakis were doing initial surveillance for an attack. Bet on it.
From a terrorism story today in us.rediff.com:
As one (Pakistani) quipped: "Every second jihadi I know has a computer and is always busy checking information on buildings in the US--their height & width and their possible vulnerable areas--and it is their routine practice to make plans with computer graphics to bring down US buildings to the ground."