Separate investigations by bellingcat and the BBC both concluded that drone-dropped incendiary grenades were used to attack two boats of Greta Thunberg's Global Sumud Flotilla.
https://www.bellingcat.com/news/2025/09/10/incendiary-munitions-strike-gaza-bound-flotilla-two-nights-in-a-row/
https://www.bbc.com/news/videos/cyv64eppj56o