The organizers of the Global Freedom Flotilla said Wednesday that a second vessel in the fleet, the Alma, was struck by a drone overnight while docked in Tunisian waters. The announcement comes just two days after the flotilla reported a similar attack on another boat.

In a statement posted on Instagram and cited by AFP, the flotilla said the strike caused a fire on board, which was quickly extinguished with no injuries reported.

The flotilla is carrying activists and humanitarian aid bound for the Gaza Strip, aiming to challenge Israel’s blockade on the territory.