A note expressing support for ISIS was found near the body of the gunman who killed a French cop on the Champs-Elysees in Paris, officials said.

Anti-terrorism prosecutor Francois Molins said the note apparently fell out of the pocket of Karim Cheurfi, a 39-year-old with a criminal record, after he was shot dead.

Molins said the note also listed the addresses of security sites.

The terror group has claimed responsibility for the attack — giving the attacker a war name indicating he had ties in Belgium and praising him as a “fighter of the Islamic State,” the Independent of the UK reported.

The speed of the claim of responsibility and the fact the attacker was identified suggests he was in touch with the group and informed the jihadists of his plan in advance, the paper reported.

ISIS has previously assigned war names to militants who carried out attacks in Paris and Brussels that were coordinated with commanders in Syria.

“Lest the operation be mistaken for one of the many random acts of violence that plague the West, it is essential to leave some kind of evidence or insignia identifying the motive and allegiance to the caliphate, even if it is something as simple as a note,” according to an October article calling for knife attacks.

With Post wires