Hackers got into computers at the U.S. Treasury Department and possibly other federal agencies, touching off a government response involving the National Security Council. Security Council spokesperson John Ullyot said Sunday, Dec. 13, 2020 that the government is aware of reports about the hacks. The nation's cybersecurity agency warned of a “grave” risk to government and private networks. The agency previously said the perpetrators had used network management software from Texas-based SolarWinds t o infiltrate computer networks. Members of Congress said they feared that taxpayers’ personal information could have been exposed because the IRS is part of Treasury, which used SolarWinds software.