Portions of the viewing stands for the inaugural parade may still be seen outside the White House, but taking them down is not the only unfinished business remaining in Washington from Jan. 20.

D.C. police continue their search for whoever set a woman’s hair on fire along the parade route that afternoon.

The flames were relatively small and apparently caused no injury. They were extinguished on the spot, and quickly.

But the person who used what is believed to be a cigarette lighter in the incident is still at large, and last week police issued a second appeal to help find the individual they describe as a “person of interest” in the assault.

The original request included still photographs, and police said they may have received the name of the person they wanted to speak with.

However, in the announcement issued Wednesday, police said that person was not the one connected to the 2 p.m. incident. They said she had been “ruled out” and have continued the search.

An online video of the incident appears to depict a few moments in which supporters and opponents of President Trump find themselves embedded in a large crowd assembled near the parade route in the 700 block of Pennsylvania Avenue NW.

Fists are thrust aloft and placards brandished, largely by opponents of the president. But the scene appears peaceable enough to prompt at least one of the Trump supporters to pose for a picture with the protesters as the backdrop.

Despite the vehemence of some of the protesters’ chants, everything seems orderly.

The Trump supporter stands with her back to them and her long brown hair running down behind her. She poses happily, pointing to her ball cap with “Trump” emblazoned on the front.

In the video, an arm reaches toward her from the dense crowd.

Moments later, someone notices the small flame on the victim’s hair. He pats it out amid cries of surprise and dismay from some in the crowd.

One or two of the protesters are shown apologizing before the two-minute, 29-second video ends.

Police have said they have no doubt that the video is genuine.

Many arrests were made in connection with demonstrations that turned destructive several blocks north of the sites of the inauguration ceremony and the inaugural parade, where protesters set a parked limousine on fire and broke storefront windows. It is not clear that there were any arrests in connection with the parade or swearing-in ceremony.

As of Sunday evening, police said no arrest had been made in the parade route incident.