There is some confusion 'concerning' [='regarding'] his current whereabouts.
news 'concerning' friends
(..) let me put it this way. The operative word here would be "federal." I'm now ordering you to release... all pertinent information concerning Teresa Banks, both while living and deceased. Your basic kill. Banks was a drifter, and nobody knew her. Where's the body? (..)1992 Twin Peaks: Fire Walk with Me