CBS Evening News for Thursday, May 11, 1972
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(Studio) As mines armed, 7 North Vietnam ports sealed off. American jets continue to hammer North Vietnam targets. Off coast, United States 7th fleet warships pound Don Son peninsula. 36 foreign ships in Haiphong ports when Nixon announced mining. 5 sailed prior to deadline; 31 remain in port.
REPORTER: Charles Kuralt
(Pentagon) Mines loaded on United States carriers several weeks ago. Department of Defense films of mine sowing released 5 years ago, shown. Mines moored by anchor, floating at various depths under water. Some sensitive to metal, others to changes in ocean pressure, others to sound. After a certain period of time, they will automatically go dead. Russian mine sweepers described. Helicopters can detonate mines. [Admiral Elmo ZUMWALT - says American ships stnd. in Gulf of Tonkin to warm approaching vessels not to enter mined waters. They use radio, lights flags, megaphone. Reaffirms Secretary Defense Laird's statement that United States will take action to prevent resupply of North Vietnam.]
REPORTER: Bob Schieffer
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