This happened yesterday according to The Poplar Report on Youtube. Hack was called "Clop" and happened thru "Move it" software that huge businesses use to condense and store info. AT&T is mentioned at 6:02 in video. Many big businesses and agency's are mentioned so have your pen ready. CNN only mentions that a cyberattack did happen but no list who of where to confirm.
O.K. techies now dig and find us more on this please.