A police officer was shot dead and a gunman killed near Paris’ famed Champs Elysees on Thursday night.

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The attacker, who was not identified, was killed by officers returning fire after he aimed at police before 9:30 p.m. local time and fired multiple shots, according to the French interior ministry.

Two other people were seriously injured.

It was not immediately clear what motivated the attack. Authorities have launched a counter-terrorism investigation.