Assertion: blockade | /r/HasProperty | announced
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Source sentences:
text: Beginning June 26, 1948, two days after the blockade was announced, U.S. and British planes carried out the largest air relief operation in history, transporting some 2.3 million tons of supplies into West Berlin on more than 270,000 flights over 11 months.
text: In the initial weeks after the blockade was announced, Qatar’s imports dropped nearly 40 percent from the same time a year earlier.