There was no official confirmation of the decision to upgrade the warrant, but Denise O'Donnell, the U.S. attorney for the Western District of New York in Buffalo, has scheduled a news conference Thursday to announce a  major development  in the Slepian murder investigation. Erie County District Attorney Frank Clark, Bernard Tolbert, the special FBI agent in charge of the Buffalo office, and other investigators will also (be) there.  
 Verb: be
Yes