Abukeshek was detained alongside Brazilian activist Thiago Ávila after the Israeli navy stopped the humanitarian vessel, while dozens of other activists were intercepted by the Greek coast guard and taken to the island of Crete, according to officials and legal representatives.

Spanish Foreign Minister José Manuel Albares described the detention as unlawful and said he had raised the matter directly with his Israeli counterpart.“This is a case of illegal detention in international waters, outside the jurisdiction of Israeli authorities,” Albares said in an interview with Spain’s public radio.

“I have made this clear to my Israeli counterpart.”The Legal Center for Arab Minority Rights in Israel, known as Adalah, said it visited both men at a detention facility in the Israeli port city of Ashkelon and reported that they had begun a hunger strike.

The group said the two activists alleged they had been repeatedly beaten while in custody and were subjected to isolation, prolonged blindfolding and physical assault.“Adalah maintains that the treatment of the two activists, including the use of isolation, prolonged blindfolding and physical beatings, constitutes a grave violation of international law,” the organization said in a statement.

Israel’s Foreign Ministry said in an online post that Abukeshek and Ávila were being questioned over possible links to the Palestinian militant group Hamas and confirmed that both had been granted consular access.

The detention has added fresh strain to already tense relations between Israel and Spain, one of Europe’s most vocal critics of Israel’s military campaign in Gaza.Spain formally recognized Palestinian statehood in 2024, a move that triggered strong objections from Israel and widened diplomatic friction between the two governments.

Prime Minister Pedro Sánchez intensified criticism on Friday during a campaign event ahead of regional elections in southern Spain, directly addressing Israeli Prime Minister Benjamin Netanyahu over the detention.“Now that Netanyahu has taken foreign citizens, including a Spanish national, and brought them to Israel, I have a few things to say to Prime Minister Netanyahu,” Sánchez told supporters of his Socialist Party.

“First, Spain will always protect its citizens. Second, we will always uphold international law — and this is yet another violation of it,” he said. “And third, we demand the release of the Spanish citizen who has been illegally detained by the Netanyahu government.”

The case has drawn wider attention across Europe as international activists continue attempts to deliver humanitarian aid to Gaza amid the prolonged conflict and worsening humanitarian conditions in the enclave.

In a joint letter to EU leaders, Mette Frederiksen and Giorgia Meloni said Europe “cannot risk a repeat” of the earlier influx, when hundreds of thousands arrived, many fleeing the Syrian civil war.

The two leaders urged the European Commission to adopt a 458-million-euro ($527 million) humanitarian aid package aimed in part at supporting populations affected by the Middle East conflict before displacement leads to onward migration toward Europe.

“The ongoing conflict in the Middle East is increasingly worrying,” they wrote, noting that the region already hosts large numbers of displaced people. They warned that unmanaged flows could have implications not only for those directly affected but also for the “security and cohesion” of the European Union.

Their proposal emphasizes assistance to countries in the region to manage displacement locally, reducing the likelihood of large-scale migration toward Europe.

Frederiksen and Meloni said the EU must strengthen its external borders and improve preparedness to respond to potential migration pressures. “We cannot afford to be taken by surprise as in the past,” they said, calling for proactive steps if the situation deteriorates.

The initiative reflects a broader push among some EU leaders to tighten migration policies in response to geopolitical instability and evolving security concerns.

The issue has also been raised by other European leaders. Friedrich Merz warned earlier this month that instability in Iran could have “far-reaching consequences,” including increased migration flows.

Frederiksen and Meloni were joined by Rob Jetten and other EU representatives in informal discussions with the European Commission on “innovative” approaches to limit immigration in light of the conflict.

The warnings come as the war, which began with a bombardment of Iran by the United States and Israel in late February, continues to reshape regional dynamics and raise concerns across Europe.