The phrase "an unidentified assailant" is correct and usable in written English.
It can be used in contexts involving crime or violence when referring to a person who has attacked someone but whose identity is not known.
Example: "The police are investigating the incident involving an unidentified assailant who attacked the victim late last night."
Alternatives: "a nameless attacker" or "an unknown perpetrator."
An Indian artist was brutally attacked by an unidentified assailant during an exhibition of his homoerotic paintings in Delhi, the Times of India is reporting.
A6 Swedish Foreign Minister Dies Anna Lindh, the Swedish foreign minister, died of stab wounds suffered when an unidentified assailant slashed her on Wednesday with a knife.
He said that an unidentified assailant had shot both men and that he then shot each of them several times to stop their suffering.
Ms. Lindh died of stab wounds after an unidentified assailant attacked her as she shopped in a department store in central Stockholm on Wednesday.
Anna Lindh, the widely respected Swedish foreign minister mentioned often as a potential leader of the nation, died early today of stab wounds suffered Wedndesday, when an unidentified assailant slashed her repeatedly with a knife in a department store.
Fernando Baldomero, the chairman of a provincial chapter of the party, Bayan Muna, was killed by an unidentified assailant outside his home while preparing to send his child to school in Aklan Province, in the central Philippines, according to Representative Teodoro Casiño, a member of the Philippine Congress who also belongs to Bayan Muna.
The unidentified assailant was pursued into a nearby subway station, where he killed himself, police said.
The unidentified assailant entered the school in a suburb of Zibo in Shandong Province around 4 p.m. Tuesday as parents were picking up their children, according to residents contacted by phone.
The decisions follow an attack by unidentified assailants on a police station in North Sinai that resulted in the death of 16 policemen on 6 August.
The parish's choir director was wounded in the shootings at the Church of St. Thomas by the unidentified assailant.
After the assault, the unidentified assailant, chased by school security officers, ran from the 280-acre campus, Sergeant Warshany said.
