The Global Sumud Flotilla (GSF), an international aid initiative to deliver vital supplies to the Gaza Strip, said Wednesday that one of its boats was attacked by a drone at a Tunisian port in the second such strike in two days.

The GSF, which is seeking to break Israel's naval blockade and deliver humanitarian aid to war-torn Gaza using civilian boats, said in a statement that all passengers and crew were unharmed.

The GSF reported the first attack on Tuesday, saying one of its vessels had been struck by a drone in Tunisian waters at the Sidi Bou Said port. Tunisian authorities said the reports were false.