An Israel-made drone operated by Greece’s Hellenic Coast Guard has hovered over the Madleen ship for a second night, Al Jazeera reports.

Thiago Avila, a steering committee member of the Freedom Flotilla Coalition, who is on board the Madleen, has now reported a “new drone threat against our humanitarian mission” about 57km from Greece in international waters.

“This time the drone came closer than any other and passed above our boat, which is a critical threat, considering one month ago Israel bombed our boat in conditions like these at a similar hour,” he wrote in a post on Instagram.

The source of the drone is yet to be confirmed, AJ noted.