The U.S. Federal Bureau of Investigation is probing a possible China connection with the reported breach on U.S. Postal Service computers. The breach compromises personal and official data about more than 800,000 USPS employees.

The data included names, dates of birth, social security numbers, addresses, dates of employment and other information. Officials said. Every employee from the letter carrier to the postmaster general was exposed. No credit card data from USPS offices were compromised, according to the official announcement.

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The Washington Post is reporting that the breach was discovered in September, although the USPS announced the incident only Monday, as President Barack Obama arrived in Beijing for the APEC summit and for meetings with Chinese President Xi Jinping.

Early this year, the Office of Personnel Management discovered intrusions into its systems, as well as those of its security-clearance contractor, USIS. Individuals who have knowledge of the investigation said both cases have been traced to China.

Obama will definitely discuss cybersecurity when he meets with Xi, as other senior U.S. officials have repeatedly mentioned it when they meet with counterparts in Beijing.

On the USPS breach, agency spokesman David Partenheimer said the intrusion was carried out by a sophisticated actor that seems to be not interested in identity theft or credit card fraud, implying the actor has more serious motives in mind.

Postmaster General Patrick Donahoe said in a statement that that every organization connected to the Internet is a constant target for cyber intrusion activity.

"The United States Postal Service is no different. Fortunately, we have seen no evidence of malicious use of the compromised data and we are taking steps to help our employees protect against any potential misuse of their data," said Donahoe.

Congressman Elijah Cummings, ranking member of the House Committee on Oversight and Government Reform Committee, wrote Donahoe and asked to be provided details on the intrusion.

"The increased frequency and sophistication of cyber-attacks upon both public and private entities highlight the need for greater collaboration to improve data security," he said in the letter.