Negotiations to reach a ceasefire in the Gaza Strip have entered a “dark tunnel” and their fate is uncertain after the <a href="https://www.thenationalnews.com/news/mena/2024/07/31/who-israel-killed-hamas-hezbollah-leaders/" target="_blank">assassination </a>of Hamas leader and senior negotiator <a href="https://www.thenationalnews.com/news/mena/2024/07/31/ismail-haniyeh-who-hamas-leader/" target="_blank">Ismail Haniyeh</a>, sources told <i>The National</i> on Friday. Mr Haniyeh, the group's political chief, and his bodyguard were killed in <a href="https://www.thenationalnews.com/news/mena/2024/08/02/hamas-chief-ismail-haniyeh-to-be-buried-in-qatar-amid-vows-of-revenge-against-israel/" target="_blank">a guesthouse</a> in Tehran on Wednesday. Iran, Syria, Hezbollah, Hamas have blamed Israel. But Israel has neither confirmed nor denied its involvement. Mr Haniyeh played a key role in talks for a potential <a href="https://www.thenationalnews.com/news/mena/2024/08/01/palestinians-want-unity-after-haniyeh-assassination/" target="_blank">ceasefire </a>in Gaza, liaising with mediators Qatar, which has led months of negotiations alongside Egypt and the US. The assassination <a href="https://www.thenationalnews.com/podcasts/beyond-the-headlines/2024/08/01/beyond-the-headlines-what-next-after-the-hamas-and-hezbollah-assassinations/" target="_blank">threatens</a> to derail the efforts to secure a ceasefire in Gaza, where about 39,400 people have been killed and more than 90,000 injured since October. The war began when Hamas-led militants attacked Israel and killed about 1,200 people. "The negotiations are now not just in a dark tunnel, but they have actually died a clinical death," one source said. Another source said: "No one can now tell you what comes next." A Hamas official said earlier that the group will start discussing the fate of the talks after “a week or two”. “The Gaza and hostage negotiations, after the <a href="https://www.thenationalnews.com/opinion/editorial/2024/08/01/haniyehs-assassination-is-the-latest-act-in-a-spiral-of-lawlessness/" target="_blank">assassination </a>of Ismail Haniyeh, cannot now be put up for discussion or resumption before a week or two,” the member of Hamas's political leadership told <i>The National</i>. Israel "does not want to complete the deal", he added. Qatar and Egypt suggested on Wednesday that the killing of Mr Haniyeh could further jeopardise efforts to secure a <a href="https://www.thenationalnews.com/news/2024/07/31/us-looks-to-salvage-gaza-peace-talks-after-hamas-leader-killed-in-iran/" target="_blank">ceasefire </a>in Gaza. “Political assassinations and continued targeting of civilians in Gaza, while talks continue, lead us to ask, how can mediation succeed when one party assassinates the negotiator on the other side?” Qatari Prime Minister Sheikh Mohammed bin Abdulrahman Al Thani wrote on X. US President Joe Biden stressed late on Thursday that he was "very concerned" about <a href="https://www.thenationalnews.com/news/mena/2024/08/01/lebanon-israel-war-fouad-shukr/" target="_blank">rising tensions</a> in the region and added that the killing of Mr Haniyeh had "not helped" the situation. The White House said Mr Biden spoke with Israeli Prime Minister <a href="https://www.thenationalnews.com/news/us/2024/07/26/kamala-harris-ceasefire-gaza/" target="_blank">Benjamin Netanyahu</a> by telephone and promised to defend Israel's security "against all threats from Iran". "We have the basis for a ceasefire. They should move on it and they should move on it now," Mr Biden told reporters after the call. In Gaza, the Israeli army continued its bombing campaign amid calls by <a href="https://www.thenationalnews.com/news/mena/2024/08/01/families-of-israeli-hostages-fearful-for-gaza-ceasefire-deal-after-hamas-leader-killing/" target="_blank">family members</a> of Israeli hostages held in the enclave to agree to a ceasefire deal. At least four people were killed in an Israeli strike on an apartment building in <a href="https://www.thenationalnews.com/news/mena/2024/08/01/israel-claims-hamas-commander-mohammed-deif-was-killed-in-strike/" target="_blank">Gaza </a>city on Friday morning, the Wafa news agency reported. The Palestine Red Crescent Society said the victims were members of the Abu Hashem family.