noun
attacker; aggressor; assailant
Refers to a person or entity that initiates an attack, whether physical, verbal, or in a conflict.
警察は攻撃者の身元を調べている。
The police are investigating the identity of the attacker.
ネットワークへの攻撃者は特定されていない。
The attacker on the network has not been identified.
襲撃者 implies a sudden raid or assault, often with a connotation of surprise, whereas 攻撃者 is a more general term for an attacker.
Compound of 攻撃 (kōgeki, 'attack') and 者 (sha, 'person').