A New York Yankees ticket rep apparently sent out an email blast that included a spreadsheet containing the names, addresses, phone numbers, and email addresses of 20,000 season ticket accounts, according to a report in DeadSpin.com, a sports website.

The massive security breach released the names, home addresses, fax numbers, e-mail accounts and exact seat location of the fans, for about half of the total number of season-ticket holders. 

The Yankees office only admitted their blunder last night in an email from the team chief operating office Lonn Trost.

According to the New York Post, he assured them that neither their Social Security numbers or any financial information such as credit-card data was revealed, nor were birth dates.

They claim that the information was only unwittingly leaked on Monday, when the employee accidentally attached to an e-mail a spreadsheet containing the sensitive information.

The season-ticket rep immediately realized his mistake and tried to 'recall' the e-mail but failed, said sports blog Deadspin.