>> let's get to latest on these bombings. perhaps the only person who knows the motive for the attack is sedated with a tube running down his throat. d dzhokhar tsarnaev is under heavy guard this morning in a boston hospital. the 19-year-old suspect will face federal terrorism charges and possibly murder charges in massachusetts. we have also learned more about the shootout early friday in watertown that led the other suspect, his older brother, dead. the police chief told cnn that officers found handguns, a rifle and at least six bombs including one made from a pressure cooker at the scene. he also said that during the gun battle, the surviving suspect drove a stolen car toward officers and ended up dragging his own brother down the street. investigators now also saying the evidence suggests the brothers acted alone. meanwhile, at least 57 bombing victims are still in the hospital. two of them in critical condition. >> in just about two hours, the