AT least one person is dead and 18 are missing after a road caved in on a subway tunnel under construction in the eastern Chinese city of Hangzhou yesterday.

昨日，在浙江省省会杭州发生正在施工过程中的地铁隧道上的路面塌陷事故，已经造成至少1人死亡18人失踪。

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As night fell, searchers were still looking for another person who was missing after a second avalanche about a half-mile from the first, on national forest land.

黑夜降临了，距第一次雪崩发生地约半英里远的地方又发生了雪崩，随后营救人员继续寻找另外一名失踪者。

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At least one person is dead and 16 more are missing after a helicopter crashed in the freezing Atlantic Ocean.

在冰冻的大西洋发生直升机坠机事件后，已有至少一人死亡，16人失踪。

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They are usually informed of cases after 72 hours if the missing person has not been found, but high-risk reports are escalated sooner.

BBC: What happens when someone goes missing?