Greta Thunberg’s flotilla carrying humanitarian aid toward Gaza was struck by a drone in Tunisian waters, its organizers said late Monday.

Axar.az reports, citing Politico, crew members said the drone hit Global Sumud Flotilla’s (GSF) main vessel when its was anchored outside the port of Sidi Bou Said in Tunisia. The boat sustained damage to its main deck and below-deck storage, according to footage published on X by the GSF.

Nobody on board was harmed.

Tunisian authorities, however, denied the reports of a drone attack.

Houcem Eddine Jebabli, a spokesperson for Tunisia’s national guard, said an investigation was “ongoing” but “no drones have been detected,” calling the reports “completely unfounded.”

Israeli authorities have dismissed attempts to ferry aid to Gaza as publicity stunts. In June, the country’s forces intercepted another aid ship that Thunberg was on.