searching for evidence in this house of horrors. throughout the day, fbi agents meticulously searched, removing the front door, searching the crawl space, carting away a red pickup and jeep. at one point bringing in a cadaver dog. the fbi taking the lead in the search. >> this is the tip of the iceberg, this investigation will take a very long time. >> reporter: the three suspects, 52-year-old ariel castro, his brothers, pedro and onil behind bars to face more interrogation today. authorities have 4 8 hours to file charges, and that window closes later on tonight. residents are still celebrating, jubilation with shock and disbelief. >> unreal. i know who lived there, and they panned the camera to his house, i turned white. my wife says are you okay?