Given the task definition and input, reply with output. In this task, given a sentence in the Chinese language, your task is to convert it into the English language.

在格拉斯哥机场发生事故后，内政大臣雅克·史密斯宣布，英国的国家威胁级别从“严重”上升到“紧急”，这表明恐怖分子可能会“迫切”发起攻击。

Following an incident at Glasgow airport, Home Secretary Jacqui Smith announced the elevation of the UK's national threat level from "Severe" to "Critical", indicating that an attack could be expected "imminently".