Updated at 11:20 a.m. ETAmerican lawmakers and European leaders have reacted with skepticism following the Saudi government's confirmation of journalist Jamal Khashoggi's death.According to the Saudi statement, "discussions that took place between him and the persons who met him during his attendance in the Kingdom's consulate in Istanbul led to a quarrel and a brawl with the citizen/Jamal Khashoggi, resulted in his death." Eighteen Saudi nationals have been arrested as the investigation continues.The Saudi statement, issued early Saturday from Riyadh, offers the official Saudi account of what happened inside the Saudi consulate on Oct. 2. It comes despite the claims of Turkish officials who have said they have evidence of his killing, including an audio recording of Khashoggi's death."Turkey will uncover whatever happened. No one should have doubts about that," Omer Celik, a spokesperson for Turkey's ruling party, said on Saturday. That's according to Turkey's state news agency, Anadolu.The Saudi government's version of Khashoggi's death has shifted since his disappearance. Saudi state media initially claimed that Khashoggi left the Saudi consulate alive, while Turkish officials claimed early on that Khashoggi had been killed.In an interview with Fox News on Sunday afternoon, Saudi Arabia's foreign minister Adel al-Jubeir called the murder "a rogue operation" and said, "We are determined to pursue this [investigation] to the end in order to uncover the truth and make sure that everybody knows what happened." Saudi state media released statements on Saturday claiming that Bahrainand the United Arab Emirates fully supported the investigation. The Egyptian Ministry of Foreign Affairs said in a statement that the investigation "demonstrates the Kingdom's keenness and commitment to finding the truth of this incident."According to the official news agency WAM, the UAE on Saturday backed Saudi Arabia's statement about the death of Khashoggi. "Since its establishment, Saudi Arabia has always been fair and does not hesitate to apply its provisions," WAM said in Arabic.The secretary-general of the Organization of Islamic Cooperation Yousef bin Ahmad Al-Othaimeen "praised the transparency of the Saudi government's handling" of Khashoggi's disappearance. "The Saudi judiciary, which has integrity and independence, will issue fair judgments and it is not appropriate to prejudge judicial rulings," he said.At a defense event on Friday evening, President Trump told reporters he found the Saudi statement credible and called the arrests "a big first step," Reuters reports. On Saturday, Trump told reporters that no one in the administration has heard audio or seen video of the events in the Saudi consulate. He added that he plans on speaking with Saudi Crown Prince Mohammed bin Salman."It's possible," Trump said, that Mohammed didn't know about Khashoggi's death.The White House released a statement following the Saudi confirmation, which read: