A U.S. Capitol Police Officer has been arrested and charged with two counts of obstruction of justice for allegedly directing a Jan. 6 insurrectionist to remove posts from social media that showed the individual storming the U.S. Capitol.

According to charging documents filed Thursday in D.C. District Court, officer Michael Angelo Riley exchanged a series of Facebook messages with an individual who shared images of himself inside the Capitol on Jan. 6., instructing him to remove posts that could be used as evidence against him in court. In the days, weeks, and months following the storming, officials have relied heavily on social media to identify rioters, many of whom publicly documented their behavior inside the Capitol on the sixth.

Riley then allegedly deleted those messages “to impair their use in the federal investigation resulting from the January 6 breach of the U.S. Capitol,” according to the charges filed by acting U.S. attorney for D.C. Channing Phillips. Riley’s messages to the individual, with the alleged intent of removing evidence that could be used in an investigation, constitute one charge; his alleged deletion of his correspondence with the individual makes up the second count.

On Jan. 7, one day after the insurrection, Riley allegedly reached out to an individual he had friended on Facebook about a week prior. According to court documents, the two didn’t know each other personally, but were both members of fishing-related Facebook groups. (Riley was not at the Capitol on the 6th, but was responding to reports of an explosive device outside the Capitol, per the charging documents.)

The individual, who is not named in the court documents, had posted selfies, videos, and “other commentary on Facebook admitting his presence and conduct inside the U.S. Capitol,” per the charging papers.

“Hey … im a capitol police officer who agrees with your political stance,” reads the first message Riley sent the insurrectionist, as quoted in the documents. “Take down the part about being the building they are currently investigating and everyone who was in the building is going to charged. Just looking out!”

The indictment quotes from a series of messages the two allegedly exchanged over the following days, including an exchange of videos the insurrectionist had taken inside the Capitol.

“I get it … it was a total shit show!!!” reads another message from Riley in the documents. “Just wanted to give you a heads up … Im glad you got of there unscathed We had over 50 officers hurt, some pretty bad.”

Riley went on to advise the individual that he shouldn’t “sweat it” in regards to any legal repercussions, and speculated that prosecutors may not charge everyone involved in the storming. To date, 674 people have been arrested and charged with crimes related to their conduct on Jan 6.

At one point, the indictment continues, a second person reached out to Riley and shared videos and pictures of the individual smoking a hand-rolled cigarette inside the Capitol. (Federal prosecutors arrested a New York resident in January who had taken photos and videos of himself smoking a joint inside the Capitol, and other insurrectionists had posted or taken videos and images smoking inside the building.)

Weeks later on Jan. 20, the individual allegedly told Riley he had turned himself into the FBI, and informed him that officials were searching his phone. Riley responded, “That’s fine,” and subsequently deleted all of their Facebook direct message correspondence, according to the indictment.

The next day, Riley allegedly messaged the person for the last time, regarding the video he’d received of the individual smoking in the Capitol. “I tried to defend you but then he showed me a video of you in the Capitol smoking weed and acting like a moron,” the charging documents quote him as writing. “I have to say, i was shocked and dumbfounded, since your story of getting pushed in the building with no other choice now seems not only false but is a complete lie. I feel like a moron for believing you … I was so mad last night I deleted all your post, but i wanted to text you this morning and let you know that I will no longer be conversing with you.”

Riley marks the first USCP officer to face charges relating to their conduct during the insurrection — an attack that left one woman dead, and the USCP department “forever changed.” At least three officers who responded on Jan. 6 have died since the attack: USCP officer Brian Sicknick died of natural causes the day after sustaining injuries while responding to the insurrection; USCP officer Howard Liebengood died by suicide three days after the insurrection, and D.C. police officer Jeffrey Smith died by suicide later in January.

Following an internal USCP investigation, the department announced last month that “disciplinary action” was recommended against six USCP officers for their actions on Jan. 6. The violations included three cases of “conduct unbecoming,” one for failure to comply with directives, one for improper remarks, and one for improper dissemination of information.

Riley is set to appear before a district court judge for D.C. on Friday afternoon.