Swedish climate activist Greta Thunberg was detained by Israeli forces while participating in a maritime mission to break the Gaza blockade. Her arrest quickly sparked protests worldwide and raised questions about Israel’s naval actions.

The Flotilla’s Humanitarian Mission

The Global Sumud Flotilla is one of the largest recent efforts by activists and international lawmakers to challenge Israel’s Gaza blockade, in place since Hamas took control in 2007. The convoy included more than 40 boats and around 500 participants, including parliamentarians, lawyers, and activists from multiple countries. Organisers said they aimed to deliver food, water, and medicine directly to Gaza civilians rather than rely on Israeli-controlled channels. The flotilla left Barcelona on August 31, 2025, and joined other ships at Mediterranean ports in Spain, Italy, and Turkey. Organisers emphasised that the operation is a non-violent humanitarian effort designed to highlight Gaza’s worsening crisis.

Israeli Interception at Sea

On Wednesday evening, Israeli naval forces intercepted the flotilla about 70 nautical miles from Gaza. Videos from both Israel and flotilla participants showed tense encounters. Thunberg appeared seated on a deck surrounded by armed soldiers. The Israeli Foreign Ministry confirmed her detention, stating, “Several vessels of the Hamas-Sumud flotilla have been safely stopped and their passengers are being transferred to an Israeli port. Greta and her friends are safe and healthy.”

Meanwhile, flotilla organisers accused Israel of aggressive tactics. They claimed one ship was deliberately rammed while two others were hit with water cannons. Israel reportedly disrupted communications, including live video feeds. Some activists were forcibly taken to Israel. By Thursday, 13 boats had been intercepted, but 30 continued toward Gaza. Organisers vowed the flotilla would proceed despite obstacles.

Israel’s Justification for the Raid

Israel argued that the flotilla ignored multiple warnings and attempted to breach a lawful blockade during wartime. The navy offered alternative routes, including the port of Ashkelon. Officials dismissed the flotilla as a political stunt rather than a relief mission. Ambassador Jonathan Peled said, “This systematic refusal (to hand over the aid) demonstrates that the objective is not humanitarian, but provocative.” UN Ambassador Danny Danon warned that participants trying to enter Israeli territory illegally would be deported after Yom Kippur. He added, “We will not allow any PR stunt approaching an active war zone to violate our sovereignty.”

Alleged Hamas Links

Israel claimed Hamas had ties to the flotilla. Authorities said they recovered documents linking flotilla leaders to Hamas’ foreign arm, the Palestinian Conference for Palestinians (PCPA). A 2021 letter from former Hamas political chief Ismail Haniyeh endorsed the PCPA. Zaher Birawi, a long-time flotilla organiser, was listed as a member. Israel described the PCPA as Hamas’ representative abroad. However, flotilla organisers rejected these claims and insisted the mission was non-violent and humanitarian.

Global Reactions

The interception triggered protests and diplomatic reactions worldwide. Turkey condemned the raid as an act of terror, leading to demonstrations in Istanbul. Colombian President Gustavo Petro expelled Israel’s diplomatic mission and called the detentions a potential “new international crime.” Malaysian Prime Minister Anwar Ibrahim condemned Israel’s actions, confirming that eight Malaysians were detained. France and Italy urged Israel to ensure participants’ safety. Protests also erupted in Italy, Greece, Tunisia, and Argentina, with crowds gathering in cities including Rome, Pisa, Florence, Turin, Istanbul, and Buenos Aires. The incident revived memories of the 2010 Mavi Marmara raid in Turkey, and Colombian authorities cited concerns about repeating past tragedies. Palestinian groups called the raid piracy.

Ongoing Mission and Safety Measures

This was not Thunberg’s first detention by Israel. In June 2025, she was on a smaller Gaza-bound boat that Israeli forces intercepted and deported. By Thursday, 30 boats remained en route to Gaza. Israel signalled that detained participants might be processed and deported after Yom Kippur. Spain, Italy, and Turkey deployed naval assets to protect their citizens. Flotilla organisers urged governments and international institutions to demand participants’ immediate release.

Humanitarian Crisis in Gaza

Israel insists the flotilla’s purpose is to provoke rather than help. Jonathan Peled emphasised, “The objective is not humanitarian, but provocative.” The flotilla occurs amid a severe humanitarian crisis in Gaza. Since Israel’s campaign began after Hamas’ October 7, 2023 attack, more than 65,000 people have died, according to Gaza health authorities. UN-backed organisations warn of famine, calling the situation man-made. Israel claims Hamas uses humanitarian aid to smuggle weapons and strengthen its military. Flotilla organisers argue that aid delivered via Israel is politicised and insufficient, insisting that only direct delivery to Gaza civilians is acceptable.