Experian, TransUnion and Equifax Share Fraud Alerts and Deleted Fraud Accounts Among Themselves

If there is one kind of information that the three national credit bureaus Experian, Equifax and TransUnion share information about it is fraud alerts and the disputes of account that are reported as fraudulent.
If an account gets deleted after a dispute that it was created as a result of fraud in all the three national credit bureaus will share that information each other to remove the fraud account from the credit reports as well.
A fraud alert can be put on a credit report if you suspect you may be made a victim of identity theft.  If you have evidence of the same you can send a copy of the filed police report or other valid identity theft documentation and add a victim statement your credit report as well.

Your name will be moved from preapproved of a mailing lists for six months. You will also get a notification that you are eligible to access a free copy of your credit report by the three credit bureaus.
If you file an extended fraud alert victim’s statement to your credit report your name will be removed from pre-approved mailing offers for five years, and you will get a notice that you can access to free copies of your credit report within 12 months of the date that the alert was added.

If you do not add a fraud alert but dispute the information of the credit bureau claiming that it was fraudulent, you are likely to receive a notice from the other credit bureaus asking you whether you would like to file a dispute with them as well.
Whenever there is fraud involved you can get a copy of your credit report for free.  The credit bureaus will notify you of this.  In order to be safe you should check the copy of your credit report from each national credit bureau to check if the information has been updated after giving them a suitable amount of time, whether you have disputed it or added a fraud alert.