Riyadh/Ankara, Oct 20: After over two weeks of shifting stories, Saudi Arabia has acknowledged that missing journalist and Washington Post contributor Jamal Khashoggi died during a fistfight inside the country's consulate in Istanbul and that 18 men had been arrested in the case.Following this admission, Turkey on Saturday vowed to reveal all details in the case. "Turkey will never allow a cover-up... We are carrying out our own independent investigation. We will reveal our own conclusion," a ruling party spokesperson said. Turkish investigators previously said that Khashoggi had been deliberately killed inside the consulate and his body was later dismembered.After 18 days in which it insisted it had no involvement in the journalist's disappearance, Riyadh on Friday night said that an initial investigation by the government's general prosecutor found that the Saudi journalist had been in discussions with people inside the consulate when a quarrel broke out and escalated to a fatal fistfight.Those responsible then tried to cover it up, a Saudi statement said. Khashoggi was a permanent resident of the US in self-imposed exile and was a fierce critic of Riyadh's human rights violations and of Crown Prince Mohammed bin Salman's policies.He went to the consulate on October 2 for paperwork needed for his upcoming wedding to his Turkish fiancee, Hatice Cengiz.An announcement carried on Saudi state TV was the first official confirmation of Khashoggi's death in Turkey, and the first acknowledgment by Saudi Arabia of its role in it."The Kingdom of Saudi Arabia expresses deep regret at the painful developments that have taken place in this case and affirms the commitment of the authorities in the Kingdom to bring the facts to the attention of the public and to hold accountable all those involved," it said.The Saudi government said it fired five top officials and arrested 18 other Saudis as a result of the initial investigation. Those fired included the Crown Prince's adviser Saud al-Qahtani and deputy intelligence chief Maj. Gen. Ahmed al-Assiri.The Saudis set up a commission, led by the Crown Prince, that will restructure the Saudi general intelligence directorate and will have one month to release a report, state TV said.The commission will consist of national security officials, the Foreign Ministry and the Interior Ministry.The Saudi statement came as the kingdom faced unprecedented political and economic pressure to explain what happened to Khashoggi.It was unclear whether the Saudi explanation, in contrast with details provided by Turkish investigators, will be enough to satisfy foreign leaders, global business executives and US lawmakers pressing for the perpetrators to be brought to justice.Turkish investigators had concluded days ago that Khashoggi was killed and dismembered by a Saudi team dispatched to Istanbul. US officials have said that Turkey has audio and video recordings providing evidence that the journalist was interrogated and killed inside the consulate and his body cut into several pieces.According to the Washington Post, CIA officials had listened to an audio recording that Turkish officials say proved the journalist was killed and dismembered by the Saudi team, according to people familiar with the matter. If verified, the recording would make it difficult for the White House to accept the Saudi version that Khashoggi's death was effectively an accident. Nor has Khashoggi's body been recovered, and the Saudi statement did not address what happened to it.Meanwhile, US President Donald Trump said that he found the Saudi claim credible, CNN said. He called the official statement from Riyadh a "good first step" and said talks with Saudi officials would continue.He added that Saudi Arabia was a "great ally in the Middle East", but "what happened is unacceptable".Trump said he would work with Congress to develop a response to Khashoggi's death, but said that he didn't want sanctions to affect US arms sales to the Kingdom.