An anonymous reader writes: The Library of Congress (LOC) announced via Twitter Monday that they were the target of a denial-of-service attack. The attack was detected on July 17 and has caused other websites hosted by the LOC, including the U.S. Copyright Office, to go down. In addition, employees of the Library of Congress were unable to access their work email accounts and to visit internal websites. The outages continue to affect some online properties managed by the library. "In June 2015, the Government Accountability Office, or GAO, published a limited distribution report -- undisclosed publicly though it was sourced in a 2015 GAO testimony to the Committee on House Administration -- highlighting digital security deficiencies apparent at the Library of Congress, including poor software patch management and firewall protections," reports FedScoop.