The U.S. is pulling out of talks for a ceasefire between Israel and Hamas, as it believes the militant group isn’t negotiating seriously, special envoy Steve Witkoff said Thursday.

Witkoff, who traveled to Europe on Wednesday to discuss Gaza and a ceasefire deal, said the group’s latest response in the talks in Doha illustrated its unwillingness to end the fighting.

“Hamas does not appear to be coordinated or acting in good faith,” Witkoff said. “We will now consider alternative options to bring the hostages home and try to create a more stable environment for the people of Gaza.”

The collapse of the talks comes as Witkoff has been pushing to restore the fragile ceasefire negotiated during the transition from the Biden to Trump administrations, a deal that collapsed in March. Israel has placed Gaza under near total siege since then, with nearly one in three people in the enclave going multiple days without eating, according to the United Nations.

It is not clear what tactic Washington will now pursue to bring the war between Israel and Hamas to an end. Witkoff’s announcement could be a negotiating tactic to try to get the group to change course in the discussions.

“It is a shame that Hamas has acted in this selfish way,” Witkoff said. “We are resolute in seeking an end to this conflict and a permanent peace in Gaza.”

While President Donald Trump and Witkoff this month had struck an optimistic tone about the ceasefire process, diplomats and analysts have been skeptical that the long-stalled process would conclude any time soon. Israeli Prime Minister Benjamin Netanyahu has repeatedly refused to discuss a permanent end to the fighting, while Hamas has repeatedly changed its demands, and some diplomats say Hamas has been slow to respond to new proposals.

Jonathan Panikoff, a former senior U.S. intelligence official who worked on the Middle East, argued the talks could restart at some point, as such processes often start and stop.

“The decision by the U.S. to walk away reflects genuine frustration and perhaps some hope that only a sincere willingness to do so will convince Hamas to reconsider its intransigence,” said Panikoff, now at the Atlantic Council.

On Wednesday, Hamas submitted a response to an Israeli and U.S. proposal to temporarily provide for a ceasefire. The details of the Hamas proposal were not immediately clear and were not made public by any of the parties at the negotiations. The militant group hasn’t yet responded to the U.S. decision to pull out of talks.

Hours before Witkoff’s statement, Israel said it would recall its negotiating team home for consultations, Reuters reported. The Israeli embassy in Washington did not respond to a request for comment.

Qatar — which has been hosting and helping mediate the talks — also didn’t respond to a request for comment.

Between early March and mid-May, Israel did not let any aid into the Gaza Strip, according to the United Nations. More recently, some aid has been allowed in, but WHO Director-General Tedros Ghebreyesus said it is nowhere near enough.

“Food deliveries have resumed intermittently but remain far below what is needed for the survival of the population,” he told reporters Wednesday, adding that 95 percent of Gaza households face severe water shortages and many hospitals in the Gaza Strip are no longer functioning.

Israel has blamed the United Nations for the famine conditions and the failures to deliver and distribute humanitarian aid.

Eric Bazail-Eimil contributed to this report.