This surveillance video released by GSF records the moment of the attack, and Reuters has verified its authenticity.
This is the second similar incident reported by the fleet in two days.
Despite the attack, the organizer said no casualties or structural damage was caused, and firmly stated that he would continue to carry out his mission of "breaking the siege of Gaza."
"We have been prepared for this and have even been trained to identify drone models," said Zahira Sumar, a pro-Pakistan activist in the fleet, in an interview with CBC News in the port of Tunisia.
Zahir Sumal is a pro-Palestinian activist in Toronto, and in the photo is Tunisia, she is a member of the International Aid Initiative
"If you want to say what impact it will only make us more."
This aid fleet of about 20 vessels aims to deliver symbolic humanitarian supplies to Gaza.
Currently they are docking in Tunisia, waiting for other ships to meet. Despite the continuous attacks, the morale of the crew was not defeated.
Who is responsible for the attack? Many activists have pointed their finger at Israel, a country that has repeatedly intercepted ships trying to sail towards Gaza by sea.
As of now, Israel has not responded to the latest allegations, and previously it usually called this type of fleet "propaganda stunt", emphasizing that blockade is a necessary measure to prevent weapons smuggling.
For the Tunisian government, the Ministry of the Interior, the Coast Guard and the Office of the Prosecutor have not commented on the matter.
"These attacks are planned attempts to interfere with and undermine our actions," the GSF stressed in a statement. "But the global Sumud fleet will not be discouraged. Our determination to break Israel's illegal siege of Gaza will not be shaken."
The handout image in this CCTV footage shows a fire in Alma, a ship in the global Sumud fleet near the Tunisian coast
It is worth noting that the attacked Alma and another Portuguese flagship named "Family are both core ships in the fleet.
They not only support the boats and provide supplies, but also carry several high-profile public figures, including Swedish environmental activist Greta Tumbery, and former Barcelona mayor Aida Colau.
In fact, this is not the first time Israel has clashed with its aid fleet. Just in June this year, the Israeli Navy boarded a yacht with British flags carrying Tunbery and others and seized it.
Section of the global Sumud fleet with Palestinian flags and other flags waiting near Sidi Busayed, Tunisia, along with ships from Tunisia
As early as 2010, the Israeli army intercepted the Turkey-led Gaza aid fleet that killed 10 activists, which triggered strong international condemnation.
Since Hamas acquired control of Gaza in 2007, Israel has maintained a land and sea blockade of the region, saying it aims to prevent weapons from flowing into armed groups.
This policy has also been accused by critics of exacerbating the humanitarian crisis in the Gaza Strip, with more than 2 million local residents facing long-term material shortages and economic difficulties.
While the road ahead is full of risks, Sumal said she is ready for possible detention. “Nothing I did was illegal.
It was a non-violent operation and we had no weapons on board except aid," she said firmly, "we really just wanted to send aid and leave. ”
At present, the fleet is still making final preparations. If security and formalities go well, they will set sail this afternoon toward the long-locked coast.
