11.   The DNA belongs to an unknown person, possibly the killer.

12.   The memorial for Lincoln at left was drawn by an unknown person following his assassination.

13.   Two unknown persons attacked an employee of a local gas station by spraying a chemical in his face and then taking away a wallet containing cash.

14.   According to the report, Schiffer filed complaints against unknown persons for faking the documents.

15.   An unknown person left a display of tulips on a table outside an entrance to Riverfront Stadium.

16.   Both murders were ordered and carried out by still unknown persons, said Zeljko Sacic, head of the police crime department.

17.   She said she still believes an unknown person snuck into the house and set the fires.

18.   The defense contends that some unknown person contributed to the stain.

19.   The party said Kullolli was called out of a video arcade by an unknown person and shot.

20.   The unknown persons, believed to be civilians, had stolen two vehicles from the Novi Sad office.