From the British base, a twin-rotor helicopter ferries U.S. Marines and equipment to Camp Dwyer, another British base that now is also home to the U.S. Marines 24th Expeditionary Unit.

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Bosnian government troops, meanwhile, raided a U.N. peacekeepers base near Velika Kladusa, taking supplies and equipment from the camp's Bangladeshi troops.

CNN: Balkan leaders pledge to ensure safety of NATO troops

The unit's 2, 300 Marines will pack up their equipment and gear for the trip back to Camp Lejeune, North Carolina, aboard the USS Nassau, USS Austin and USS Tortuga, McSweeney said.

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Other measures have included closing the Sangatte refugee camp, tightening security at the Channel Tunnel and using scanning equipment that can find people hiding inside vehicles.

BBC: NEWS | UK | Politics | Immigration checks move to France