Latest: Note defending Islamic State found next to body of gunman, reports

The gunman who shot and killed a police officer on the Champs-Elysees in Paris was detained in February for threatening police and then freed.

Update 2.40pm: A legal source claims investigators have found a note defending Islamic State next to the body of the gunman who shot dead a policeman in Paris.

The attacker was killed by security services on the Champs-Elysees last night.