5th July 1940
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The New York World's Fair ran from April to August in both 1939 and 1940. By the second season World War II had started and some exhibitors dropped out. On July 4th 1940 an unexploded time-bomb was found in the British Pavillion and taken outisde by a security man. Two officers of the NYPD Bomb squad arrived and tried to defuse it, the bomb exploded killing them and injuring by-standers. A police manhunt failed to find who had planted the bomb and the case remains open and unsolved..