An international activist group seeking to deliver aid to Gaza on a flotilla says one of its boats was hit by what it believes was a drone while docked in Tunisia. Tunisian authorities denied a drone was involved and said they are investigating a fire in a life jacket aboard the boat.

The ship, which had set out from Barcelona, was sailing under the flag of Portugal and was one of the main boats of the Global Sumud Flotilla’s aid operation, the group said. Known as the Family Boat, it was slated to bring members of the group’s steering committee, including the Swedish activist Greta Thunberg, to Gaza, it said.