While cruise lines are responsible for onboard security operations, it’s the ports themselves that must ensure safety when a ship is docked. At this point, numerous ports are weighing extra measures. In Boston, for instance, a team of dogs and their handlers, plus extra security personnel, will search cruise ships as well as trailers, most containing foodstuffs, before they load. In Florida port cities such as Tampa, Miami, Key West and Fort Lauderdale, ships are boarded with an armed escort who stays with them to (or from) the three-mile mark. There is also a 100-yard security zone around all passenger vessels that no other ship can penetrate. In addition, cruise lines are now required to provide passenger lists prior to entering any U.S. port.