Similar breaches were previously discovered at the White House, at the United States Postal Service and the National Oceanic and Atmospheric Administration. “This has impacted some of our unclassified email traffic and our access to public websites from our main unclassified system,” said one senior State Department official. Attributing attacks to a group or nation is difficult. Some previous attacks were blamed on Russia or Chinese attackers but without confirmation. The department’s email system was shut down in a planned outage Friday to make repairs and security upgrades. Security improvements were being added on the affected systems on Sunday. Media in the U.S was preoccupied about this subject and more info is expected to be available this week.