Khashoggi went to complete “routine paperwork”, the Post said, and has not been heard from since.

“We don’t know if he is being detained, questioned or when he will be released,” the newspaper said.

…His fiancée accompanied him to the consulate but was not allowed to go inside with him. Khashoggi was also required to surrender his mobile phone – which is standard practice in some embassies and consulates.

…”I don’t know what’s happening. I don’t know if he’s inside or if they took him somewhere else,” she told Reuters.

Jamal Khashoggi: Saudi journalist vanishes in Istanbul – BBC News

hmmm