Man in custody over links to Champs-Elysees gunman: Source

 Paris prosecutor Francois Molins gives a press conference on April 21, 2017 in Paris, a day after a gunman opened fire on police on the Champs-Elysees avenue.
Paris prosecutor Francois Molins gives a press conference on April 21, 2017 in Paris, a day after a gunman opened fire on police on the Champs-Elysees avenue.PHOTO: AFP

PARIS (AFP) - A man has been placed in custody for alleged links to a gunman who killed a policeman on Paris's famed Champs-Elysees just days before the first round of France's presidential election, a judicial source said Tuesday (May 16).

The 23-year-old was arrested on Monday (May 15) in the Paris region, the source said.

Investigators are trying to find out where the gunman, 39-year-old Karim Cheurfi, got the Kalashnikov he used in the April 20 attack.

A note praising the Islamic State of Iraq and Syria (ISIS) was found next to the body of Cheurfi, who shot dead an officer and wounded two other policemen and a German passerby before being killed in a firefight.

Police later found other weapons in Cheurfi's car including a shotgun and knives.

The ISIS group claimed the shooting as the work of one of its "fighters". It was the latest in a string of attacks that have claimed 239 lives around France since 2015.

However, the ISIS named the shooter as Abu Yussef the Belgian, which does not correspond to Cheurfi, who was from the eastern Parisian suburbs.