http://www.slate.com/articles/technology/future_tense/2015/06/fappening_affidavit_the_celeb_nude_photo_investigation_and_the_problem_with.html

Following the flood of nude celebrity photos posted online last year, the FBI traced hundreds of hacked iCloud accounts of celebrities to a single IP address, according to a federal search warrant and related affidavit that were unsealed this week. The affidavit from FBI special agent Josh Sadowsky fills in several holes in the sordid story, detailing both how the photos were likely stolen and how the FBI was able to trace the crime back to a single IP address registered to a Chicago man named Emilio Herrera. His electronics were seized in October.