The Washington Monument lights are back on after going out for the second time in a week.
National Park Service spokesman Mike Litterst said in an email that power went out at the monument at about 5:30 p.m. on Monday, according to The Associated Press.
The power came back on after 7 p.m. that day.
Litterst said electricians determined that the outage was due to a ground fault, even though an investigation into the matter will continue on Tuesday.
Monday’s outage comes days after the lights went out on the monument the evening of Jan. 3. That particular outage was blamed on the monument’s automated lighting system that was said to be out of sync at the time.
Officials said the lights had come back on when electricians arrived at the monument the next morning.
In Monday’s outage, the monument’s red aviation warning lights went out as well, which was not the case with the previous outage, according to The Washington Post.
The Washington Monument experienced some damage during a 2011 earthquake, which led to the indefinite closing of its elevator, The Post noted.
The damage sustained hasn’t been linked to the recent power outages, though.
According to Reuters, the Washington Monument is one of the must-see sites for tourists who travel to the U.S. capital.
The monument is located about a half-mile south of the White House, and usually can be seen with bright lights on its 555-foot structure.
Last month, the National Park Service said the monument sees about 600,000 visitors a year.
The monument, which has been closed since a 2011 quake, will reopen in 2019.
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