This is the 19627th most frequent Korean word.
억류
Detention or captivity.
In this sentence, '억류' is used as a verb in its conjugated form '억류된', describing the state of being detained or held against one's will.
그는 억류된 후에 자유를 되찾았습니다.
He regained his freedom after being detained.
Here, '억류된' modifies '시민들', showing that the citizens are subject to detention.
정부는 억류된 시민들을 구출하기 위해 노력하고 있습니다.
The government is making efforts to rescue the detained citizens.
In this case, '억류' is used as a noun to refer specifically to an incident or case of detention.