11:00 AM PT -- The Pima County Sheriff's Office tells TMZ ... a federal court-ordered search warrant was executed at a residence near E. Orange Grove Rd. and N. First Ave. Friday night, which was connectde to the Guthrie case.No arrests were made. There was also a traffic stop conducted, and a person was questioned. Again, no arrests resulted. 11:53 PM PT -- Fox News has reported that at least three people have been detained in connection with the investigation into the disappearance of Nancy