The United States is tightening security measures at federal buildings . The move came after attacks on Iran 's government last week . Department of Homeland Security Secretary Jeh Johnson is ordering more security for more than 9,500 federal government buildings and their 1.4 million daily visitors . Homeland Security Secretary Jeh Johnson called the enhanced security precautionary .
The United States is tightening security measures at federal buildings . The move came after attacks on Iran 's government last week . Homeland Security Secretary Jeh Johnson called the enhanced security precautionary .