A black van that allegedly carried the body of Saudi journalist Jamal Khashoggi from the Saudi consulate in Istanbul to the consul's residence was searched for three hours by Turkish forensics expert, local media reported October 19.
Only then, Pompeo said, "we can make decisions how or if the United States should respond".
It says reports on Mr Khashoggi's death are "completely false and baseless" and that it is "open to co-operation" to find out what happened.
Secretary of State Mike Pompeo says he told Saudi Arabia's rulers that the U.S. takes "very seriously" the disappearance of journalist Jamal Khashoggi and will await the outcome of investigations by the kingdom and Turkey before deciding how the USA will respond.
Robert Mahoney, deputy executive director of the Committee to Protect Journalists, said: "U.N. involvement is the best guarantee against a Saudi whitewash or attempts by other governments to sweep the issue under the carpet to preserve lucrative business ties with Riyadh". HRW officials dismissed the ongoing Saudi investigation and accused the kingdom of having "blood on its hands".
United Nations spokesman Stephane Dujarric said secretary-general Guterres remains very concerned about Khashoggi's fate and "has repeatedly called for the truth to come out in this situation".
Turkish officials have said they believe Khashoggi was murdered at the consulate and his body chopped up and removed.
"I visit the country regularly and see high growth potential - and high actual growth in the private sector", Mucic said in an interview.
"They will conduct a complete, thorough investigation of all of the facts surrounding Mr. Khashoggi, and that they will do so in a timely fashion", he told reporters.
Donald Trump admitted it's likely a missing Saudi journalist is dead - and has warned punishment "will be very severe" for those responsible.
Speaking to reporters after meeting Trump, Pompeo said he made clear to the Saudis that "we take this matter with respect to Mr. Khashoggi very seriously". The crown prince is next in line for the throne, which is held by his ailing, aged father King Salman. But a number of European finance ministers and many top business executives have pulled out as global pressure on Riyadh has intensified over Khashoggi.
Several vehicles with Saudi diplomatic number plates were filmed by CCTV cameras moving from the consulate to the residence just under two hours after Mr Khashoggi entered the consulate.