Officials are investigating the death of an air traffic controller found stabbed to death at EuroAirport outside Mulhouse, France, near the Swiss and German borders.
A murder investigation has been launched following the discovery, with the 34-year-old man in a pool of blood in an office at the control tower.
Authorities revealed the tower was only accessible to staff members with accreditation.
The victim has not been named.
However, French police revealed he was a married father of two who occupied a senior position at the airport.
Police sources said he had been stabbed in the throat, lung and chest, AFP news agency reports.
No suspects have been arrested and the murder weapon was not found at the scene.
Air traffic at the airport, which serves Basel, Switzerland, Mulhouse, France and Freiburg, Germany, was not affected, an airport spokesperson said.