If this came via email, disregard it, along with running a virus, malware check on your computer as well as changing passwords. The IRS doesn't send notices by email and certainly not attachments. If you've gotten nothing in the mail, don't worry.
Recieved a email sayin i owed back taxes& was to be arrested immediately...called the number you could tell the man was reading from a script but the phone was distorted tried callin from a landline..he all of a sudden couldnt hear me