某地发生一起持枪抢劫银行案件,公安人员赶到现场后,三名犯罪嫌疑人已经全部逃跑,下落不明。那么该公安机关应当何时立案?()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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