Blame France and the EU and their stupid "refugee" policies.
Suspect, a 39-year-old man with a history of robbery and drug offences, was known to authorities for suspected Islamic extremism.
Apparently, this particular denizen from the third century carjacked a woman in Paris, drove over to Orly International Airport, and attacked a soldier who was patrolling the area in an effort to take her weapon. Because after all, he be Big Man with Beard, and she be Gurrl, so obviously inferior.
It must have surprised the heck out of him when he was unable to take her rifle. It probably surprised him as well when two other soldiers shot him. In any case, he quickly assumed ambient temperature. Unfortunately for several thousand people, the airport was shut down as a result of the excitement; traffic backed up, passengers were held on planes for hours, and so on. As usual, this sort of thing triggers a cascade of related delays, not only locally, but internationally.
The Paris prosecutors' office said its anti-terrorism division was taking over the investigation and had taken the attacker's father and brother into custody for questioning.