In yesterdays journal news the Rockland county sheriffs dept. water patrol  was protecting the bridge from terrorists We are ready for you Bin Laden if you don't get us their is a fault line 1250 feet   off the Tarrytown shoreline, they say that is 1 in 10,000 that we can have a quake of up to a magnitude of 7 on the Richter scale .  that would cause the bridge to collapse in certain areas