In 2001, Karim Cheurfi (Abou Youssouf the Belgian by ISIS), who is confirmed to be a French national, disregarding his nickname, being 23 year old at the time, stole a Peugeot 405 at Roissy-en-Bry. During the car chase, both vehicles ended up in a pit. The policeman left a car and Karim took his 38 revolver and started the fire.
Karim fled the scene, yet another officer from the following car caught up with him. Cheurfi shot again. He was taken into custody and later while being questioned grabbed the gun of an officer and shot him 3 times.
He was sentenced to 20 years in jail in 2003 for a triple assassination attempt, then in 2005 his term was reduced by 5 years. Yet he was released early in 2013.
In three months he commits a robbery that ends up with a car chase and him being sentenced to 4 years in prison. Yet he was released earlier once again, in 2015.
In February 2017 he was arrested again but was released due to the lack of evidence.
Since that he was investigated by French police though he was not considered neither a threat to national security, nor an extremist.
Last night, Karim Cheurfi, a free man, was walking along Champs Elysees, took out his AK47 and, as he promised in his “telegram” account, opened the fire to kill the police officer, wounding the second one and a passerby. Two hours later ISIS claimed responsibility for the attack.