The verdict was murder by a person or persons unknown.

裁断是一人或多人谋杀，凶手身份未明。

《牛津词典》

Once again, as in "At the Hands of Persons Unknown", his account of the lynching of blacks by whites in the American South, Mr Dray is angered by injustice.

德雷经常为社会的不公平现象而义愤填膺，在“看不见的手”一文中，德雷再次对美国南部的白人对黑人处以私刑表达了愤慨之情。

youdao

If your travel stories are written well, the appreciation from known and unknown persons alike are the greatest rewards for what those travel stories could bring.

如果你的旅途见闻写得好，那些来自认识的人以及陌生人的评价便是这些旅途见闻能带给你的最好的回报。

youdao

Ms. Bary alleged she will become the victim of an "honor killing" by her family or unknown persons due to her conversion from Islam to Christianity.

CENTERFORSECURITYPOLICY: Florida Department of Law Enforcement earns an F

That didn't stop an angry MOR shareholder from smacking Sapir with a lawsuit in 2003 in Moscow, accusing FTL of working on a contract signed by "unknown persons" and threatening to void the agreement.

FORBES: Magazine Article

Unknown to her, he was under investigation in both places in connection with a missing persons case.

WSJ: Rockefeller impostor's former wife testifies