The adults need to take responsibility and guide these children. But the emotions inflamed by the case echoed past Sunday's verdict, with sheriff's deputies and state investigators arresting two teenage girls Monday for threatening the victim over Twitter. The girls -- one 15, one 16, both from Steubenville -- were in a juvenile lockup Monday night, awaiting an appearance before a judge Tuesday morning, Jefferson County Sheriff Fred Abdalla said. Grand jury DeWine said state investigators have examined tens of thousands of text messages, images and videos and talked to 56 witnesses -- from teenagers who attended the parties to assistant football coaches and the high school principal. But 16 people who may know something about what happened that August night have refused to talk, he said. I have reached the conclusion that this investigation can not be completed -- that we can not bring finality to this matter -- without the convening of a grand jury, he said in a statement Sunday. The grand jury will begin meeting around April 15 and could take a number of days to complete its work, DeWine said. And I should point out that the convening of a grand jury, of course, does not necessarily mean that indictments will be returned or that charges will be filed, he said. A grand jury is an investigative tool that is uniquely suited to ensure fairness and to complete this