Dudelange have apologised to Qarabag after a drone carrying the flag of a region disputed by Azerbaijan and Armenia caused Thursday's Europa League match to be temporarily suspended.
Play was halted in the first half of the Group A encounter in Luxembourg when a drone hovered above the pitch with the flag of the Nagorno-Karabakh region, which is derived from the Armenian flag.
Both sets of players attempted to knock the drone out of the air by kicking balls at it, with the match delayed by over 15 minutes.
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When the match resumed, Qarabag took control, gaining a 3-0 lead by half-time with goals from Abdellah Zoubir, Michel and Richard Almeida de Oliveira, before Dani Quintana's strike added further gloss after the interval.