If you describe someone or something as unidentified, you mean that nobody knows who or what they are.
He was shot this morning by unidentified intruders at his house.
他今天早晨在家里被身份不明的闯入者枪杀了。
If you use unidentified to describe people, groups, and organizations, you do not want to give their names.
His claims were based on the comments of anonymous and unidentified sources.
他的主张以一些不知姓名且身份不明的消息人士的评论为基础。