"We are catching dangerous suspects before they strike, and we are investigating them in a way that maximizes the liberty and security of law-abiding citizens, " said Rod Rosenstein, U.S. attorney for Maryland.

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At some airports, the titanium rod inserted in the bone could set off security alarms, Dr. Helfet added.

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During the afternoon the prince visited specialist fishing rod manufacturer Harrison Rods in Liverpool and ATG Access, a security company in Haydock.

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