I sincerely hope this is a glitch and he hasn't been injured or worse:
NBC News chief foreign correspondent Richard Engel has gone missing in Syria, according to Turkish news reports. The reports also say that Aziz Akyavaş, a Turkish journalist working with Engel, is unaccounted for. NBC News has been successfully keeping Engel's status subject to a news blackout—one to which Gawker agreed until now—for at least the past 24 hours.
Engel is one of our finest foreign correspondents. It's difficult to not envision the worst outcome of this news.