From the New York Times ---
"Investigation leaders said at a news conference here that a light-colored getaway van, while still being credibly sought in an earlier shooting, was not spotted on Monday night at the ninth and latest killing, in Falls Church, Va., as the police had originally reported."
I think this means that witness sightings of a white van for Monday's shooting have been determined to not be the shooter. I specifically don't think they have any van on videotape for Monday's shooting.