In this undated photo provided by Maritime New Zealand the yacht Nina, 

In this undated photo provided by Maritime New Zealand the yacht Nina, center, is tied at dock at a unidentified location. Searchers said Thursday, June 27, 2013, they have grave concerns for seven people aboard the American schooner that has been missing for three weeks between New Zealand and Australia. (AP Photo/Maritime New Zealand) EDITORIAL USE ONLY
Associated Press
In this undated photo provided by Maritime New Zealand the yacht Nina, center, is tied at dock at a unidentified location. Searchers said Thursday, June 27, 2013, they have grave concerns for seven people aboard the American schooner that has been missing for three weeks between New Zealand and Australia. (AP Photo/Maritime New Zealand) EDITORIAL USE ONLY
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