Benjamin Netanyahu “killed any hope” for the release of hostages held in the Gaza Strip after Israel's attack this week on Hamas leaders in Doha, Qatar’s prime minister said Thursday in remarks that underscored wider anger among Gulf Arab countries over the strike.

Tuesday's attack on the territory of a U.S. ally killed at least six people and alarmed countries in the Middle East and beyond, risking upending ceasefire talks mediated by Qatar and Egypt that sought to free the Hamas-held hostages in Gaza.

“I was meeting one of the hostages' families the morning of the attack,” Sheikh Mohammed bin Abdulrahman Al Thani told CNN in an interview aired late Wednesday. “They are counting on this mediation. They have no other hope for that.”

“What Netanyahu has done, he just killed any hope for those hostages,” added Sheikh Mohammed, who is also Qatar's top diplomat.

Hamas spokesperson Fawzy Barhoum said Israel's attack constituted a “derailment of negotiations efforts” and showed that Netanyahu and his backers “refuse to reach a deal.”

Hamas says its senior leaders survived the Doha strike but that five lower-level members were killed.

The militant group, which has sometimes only confirmed the assassination of its leaders months later, offered no immediate proof senior figures had survived.

Funerals for the five Hamas members and a Qatari security officer who were killed in the attack were held Thursday.

Qatar’s ruling emir, Sheikh Tamim bin Hamad Al Thani attended the service.

Qatar has hosted Hamas’ political leadership for years in Doha, in part over a request by the United States to encourage negotiations to end the war that started with Hamas’ assault on Israel nearly two years ago.

There was no immediate reaction to Sheikh Mohammed’s remarks from Netanyahu, who has continued to defend the strikes and threatened further action against Qatar a day after U.S. President Donald Trump had sought to ease tensions between the U.S. allies.