On 27 April 2011, an intern air traffic controller, Karim Ouali, allegedly killed Jean Meyer, the Chief of the Air Traffic control tower of EuroAirport Basel Mulhouse Freiburg in Saint-Louis, Haut-Rhin, France.
[5] On 27 April 2011, at 7:50 am, an employee of the air traffic control tower discovered the body of 34-year-old Jean Meyer, chief of the service, in a pool of blood.
[6] Due to the control tower's security, only staff with a special badge and key could enter, substantially shortening the police's list of likely suspects.
[8] Intern of the air traffic control tower, Karim Ouali, 35 years old, was on temporary sick leave for four months, due to issues with psychosis.
[11] In 2018, French police received information about Ouali being arrested and detained for a month by Hong Kong police, in 2014, for traveling under a fake identity ("Karim Quali" instead of "Karim Ouali"), but he was released then, having no charge on him for local record.