4 Killed In Knife Attack At Paris Police Headquarters

A 45-year-old man, an administrator in the police intelligence division, attacked colleagues at a Paris police station, killing four and injuring another before being shot dead by police. The motive remains unclear, and the attacker had no prior behavioral issues. Paris Mayor Anne Hidalgo expressed condolences and praised the police's commitment to safety.

What was unclear about the assailant's behavior prior to the attack?

What did Paris Mayor Anne Hidalgo express in her tweet regarding the victims?