There is some confusion 'concerning' [='regarding'] his current whereabouts.
news 'concerning' friends
(..) Brother. Thank you for coming. (fanfare) You are warned to stand by for an important announcement at .. This is news of the gravest consequence concerning the war with Eurasia. .. I'm very worried about the African front. The news is disquieting in the extreme. I've been worrying about it all day. (..)1984 1984