苏城的 Liberty 小学在受到外部威胁后于周一被封锁;地位被解除，但安全性得到加强。 Liberty Elementary in Sioux City was locked down Monday after an external threat; status lifted but security heightened.

苏城的 Liberty 小学在收到外部威胁后于周一被置于“安全状态”并关闭。 Liberty Elementary School in Sioux City was placed under "secure status" and locked down Monday after receiving an external threat. 警方进行了调查,并解除了这一地位,不过将继续对来访者进行甄别,并在开除期间增加警察的存在。 Police investigated, and the status was lifted, though visitor screening and increased police presence during dismissal will continue. 有关威胁的细节尚未公开。 Details about the threat are not yet public.