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http://www.sonicbomb.com/modules.php?name=News&file=article&sid=95&mode=&or der=0&thold=0

On the afternoon of March 11, 1958, the children of the Gregg family were in their playhouse in the woods behind their house in Mars Bluff, South Carolina. About four o’clock they tired of the playhouse and moved 200 feet to the side yard. This kept them from becoming the first Americans killed by a nuclear weapon released on U.S. territory.

U.S. Air Force B-47E medium bomber serial number 53-1876A dropped its nuclear weapon in the woods behind the Greggs’ house at 4:19 P.M. The high-explosive trigger in the bomb blew up on contact with the ground, leaving a crater 50 feet across and 35 feet deep and injuring the three girls. All that remained of the playhouse were a few twisted shards of the corrugated metal that had been its roof.

B-47 Stratojet