investigators scour the home on seymour avenue, searching for evidence in this house of horrors. throughout the day and late into the night, fbi agents meticulously search. removing the front door. searching the crawl space. carting away a red pickup and a jeep. at one point bringing in a cadaver dog. it's not known what, if anything, the dog found. the fbi taking the lead in the search. >> this is just the tip of the iceberg, these investigation will take a very long time. >> reporter: the three suspects, 52-year-old ariel castro, his brothers pedro and onil, behind bars. they'll face more interrogation today. authorities have 48 hours to file charges. and that window closes later tonight. in the neighborhood, residents are still celebrating the jubilance tempered with shock and disbelief. >> unreal. and i know who lived there and they brought cameras to his house it was like i turned white. my wife told me, what's wrong,