Person or persons unknown.
3 seconds sound clip from the The Mummy (1959) movie soundboard.
You can hear this line at 00:30:16.897 in the Blu-ray version of the movie.
Quote context
[...]
- The verdict of this court is murder by person or persons unknown.
- Coroner said it was the work of a maniac.
- I can't believe that. There must be a motive somewhere.
- We must go through his papers. Perhaps we'll find something there.
- He was in the nursing home for three years.
- And before that, 10 years in Egypt.
- Then, we'll have plenty to work on. Father kept a record of everything.
[...]