U.S. Secretary of State Mike Pompeo on Monday called on the government of Saudi Arabia to support "a thorough investigation" of missing journalist Jamal Khashoggi and "to be transparent about the results" of the probe.
The disappearance of Khashoggi, previously a prominent newspaper editor in Saudi Arabia, has sparked global concern, particularly after Turkish sources said over the weekend that authorities believed he was killed inside the Saudi consulate in Istanbul.
"State Department senior officials have spoken with the Kingdom of Saudi Arabia through diplomatic channels about this matter," Pompeo said in a statement Monday.
Earlier on Monday, U.S. President Donald Trump said he was concerned about reports of Khashoggi.
"I am concerned about it. I don't like hearing about it," Trump told reporters at the White House. "Hopefully that will sort itself out. Right now nobody knows anything about it."
- CNBC contributed to this report