According to Turkey, a journalist who is critical of Saudi crown, turned up at an appointment at the Saudi consulate in Turkey last week. Meanwhile a team of 15 security and intelligence agents have flown in on Gulfstream jets from Saudi and are in the consulate when he arrives. His fiance waits outside. He never leaves. Well, not in one piece it is now believed - the autopsy expert that flew in with the bone saw allegedly has seen to that. Turkish workers at the consuls residence were told at short notice and without explanation not to come to work that day.
He wrote for the Washington Post among others, so this has created ripples in Washington as well as Ankara.
Jamal Khashoggi: alleged Saudi hit squad linked to disappearance | World news | The Guardian
US intelligence were aware that the Saudi's wanted to get him back on Saudi soil. Looks like they took the loose interpretation of that.