In the U. s., we are not allowed to fire "warning shots" under any circumstances.

在美国，我们是不允许“鸣枪警告”，在任何情况下。

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The U.S. ship verbally warned the smaller boat when it was 1, 200 yards (1, 100 meters) away and fired at least one warning shot before the decision was made to fire shots to disable the boat, the officials said.

CNN: U.S. Navy ship fires at small boat in Persian Gulf