at 3:00 a.m. here on the east coast, a prominent journalist has disappeared after entering a saudi consulate in istanbul and there are growing concerns he may have been killed inside the building. the journalist in question and the critic of saudi arabia, jamal kashoji was last seen tuesday after entering the saudi consulate. what happened to him after that is still unclear. here s what we do know. a political advisor to the turkish president tells cnn there is a strong possibility that kasoji was killed inside the saudi arabia consulate. saudi arabia strongly denies any involvement. u.s. officials say they cannot confirm what happened to him, but two senior administration officials tell cnn the u.s. is quietly trying to figure out what happened to kashoji. our international diplomatic editor nick robinson has more on this mystery.