is. >>> tonight on "nightline," vanished. she was last seen working on her home computer. now rescuers race against time to find an 11-year-old girl who disappeared from her house. a special fbi unit joins the effort tonight and authorities say, every second counts. >>wol and dangerous. police arrest a soldier with bomb making materials and jihadi it wiliterature rigig outside as base already scarred by massacre. but did the military almost miss it? >>> and recession therapy. with the economy in crisis, inner peace may seem like a pipe dream. but we'll show you one thing you can do for free to cut stress and boost happiness. >> announcer: from the global resources of abc news, with terry moran, cynthia mcfadden

diagnosis of schizophrenia. abc nene contact eed noyes, bute and the family said they wanted absolute privacy. the step-father has not been charged or declared a suspect by police. in fact, at this time, there are no known suspects in her disappearance. >> we continue to investigate all aspects of this disappearance. we are looking at computers, we are looking at phones. >> reporter: and celina's facebook friends could be a key to finding her, filling in information about her daily life. >> the right way to do this is, you take every friend iner circle, probably going to be 10, 11, 12-year-old, and with their parents you interview them and figure out what was going on with her. because if children disappear by their own making, in other words, they hooked up with something over the internet, they leeft with a boyfriend, whatever it might be, there will be a trail of that. >> everybody knows everybody, everybody takes care of everybody. this is not supposed to happen. >> reporter: this...