developments overnight in the mount for those two killers who escaped from a new york maximum security prison. now this search is expanding to a neighboring state. >> here is the very latest. camp sites and boat slips in vermont are being searched. 50 digital billboards in new york, new jersey, massachusetts, pennsylvania are also displaying the mug shots of these two men. >> family members defending prison employee joyce mitchell who has been questioned in connection with the escape. abc's marci gonzalez near the prison for us. >> reporter: again, officers lined up going door to door. [ knocking ] searching for the two convicted killers who escaped from the upstate new york prison, while in neighboring vermont, where investigators believe david sweat and richard matt may have headed, police are going into neighborhoods and campgrounds, handing out these fliers. >> they are killers. they are murderers. there is no reason to believe they wouldn't do it again. they're going to be more desperate than ever. >> the mother of one of the fugitives begging him to turn himself in. >> i love you. and get back where you belong