Crossair of Switzerland has released details of an incident at Luxembourg Airport this morning in which six people were hit by gunfire when staff of a security company loading cash onto one of its Saab 2000s were held up at gunpoint.
The two attackers, two policemen and two unidentified "civilians" were injured, but there were no passengers on board and the crew was not hurt.
Crossair engineers are flying to Luxembourg to examine the aircraft in case it was hit by the gunfire.
The aircraft was about to be used to operate Swissair flight SR3879 to Zurich which was scheduled to depart at 06:55. The 37 passengers have been booked on alternative flights.
Crossair says: "Those carrying out the attack had evidently targeted a consignment consisting of several kilograms of banknotes. At the time of the hold-up no passengers were on board and the captain was carrying out his external inspection of the aircraft."
Luxembourg Airport is passing all enquiries to the police but there has so far been no police official available to give further details of what happened.