PARIS (Reuters) – One woman and three men were killed in a knife attack at the police headquarters in Paris on Thursday, Paris prosecutor Remy Heitz told reporters.

Heitz said that the home of the attacker was being searched and that anti-terrorism prosecutors were evaluating the situation. He did not elaborate on the attacker’s possible motives.

Reporting by Geert De Clercq; Writing by Matthieu Protard; Editing by Hugh Lawson