The Washington post said that officials denied to comment on who they think to be behind the attack.
however it is believed that hackers connected with state actors from Chinese Government may have been involved.
Thankfully, no credit or debit card related payment data was affected by the breach.
USPS said in a press release.
The letter written by UPS to all the affected employees as well as customers is reproduced below.
The intrusion is limited in scope and all operations of the Postal Service are functioning normally.
The privacy and security of data entrusted to us is of the utmost importance.
We know this caused inconvenience to some of our customers and partners, and we apologize for any disruption.
Employees also have the personalized assistance available to them provided by the Human Resources Shared Services Center.
We are committed to helping our employees deal with this situation.
David Partenheimer
Manager, Media Relations
U.S.
Postal Service
The FAQ about the intrusion put up by USPS is given below
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source: www.techworm.net