NBC News was first to report the new fencing. The Secret Service did not respond to a request for comment.
The extra layer of security marks the most high-profile example to date of authorities preparing for unrest following this year’s election, particularly if there is no clear winner come November 4.
Lafayette Park, across the street from the north side of the White House and a popular protest gathering spot, had also largely been fenced-in since police aggressively moved in on protesters alongside it in July.
Washington, DC, Metro Police Chief Peter Newsham warned the District’s City Council last month there was wide expectation of some type of civil unrest following the election. And many businesses in the downtown DC area in the proximity of the White House have boarded up doors and windows in the last couple of days in anticipation of possible protests.
During this past summer, some businesses saw their windows smashed and other property damaged by protesters.
Police have also been working with intelligence officials to ensure the security of Washington, DC’s airspace in the event of an attack from above, Burke added, as they routinely do when preparing for moments of heightened anxiety.
“If there’s no winner, you will see significant deployments of officers at all levels across the capital,” said Burke. “Officers will get cancellations of days off, extensions of shifts and full deployments of officers across the city.”
CNN’s Vivian Salama contributed to this report.