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Illustration: Sarah Grillo

Capitol rioters, eager to share proof of their efforts with other extremists online, have so far left a digital footprint of at least 140,000 images that is making it easier for federal law enforcement officials to capture and arrest them.

The big picture: Law enforcement's use of digital tracing isn't new, and has long been at the center of fierce battles over privacy and civil liberties. The Capitol siege is opening a fresh front in that debate.

Between the lines: A huge part of the recruitment process for both foreign and domestic terrorists is capturing imagery of foul play and using it later to recruit new members. But advances in technology make it easy for perpetrators to accidentally out themselves to law enforcement in the process.

Details: In a report issued Friday, FBI Washington Field Office Assistant Director in Charge Steven M. D’Antuono said the FBI has so far identified more than 270 suspects involved in criminal activity in and around the Capitol, in large part thanks to incoming tips that help match pictures and videos uploaded online from the attacks.

  • "In the past week alone, we’ve received nearly 140,000 photos and videos from the public," he said. The FBI has now set up a portal for people to submit tips about who may have been involved in the attacks, and who may be plotting more.

Evidence piling up: There are dozens of instances of people posting themselves on social media invading the Capitol or being spotted on video later, leading to arrests.

  • Edward Jacob Lang, 25, posted multiple videos and photos of himself at the Capitol and was charged with assault for attacking a police officer with a bat.
  • Brandon Fellows, 26, posted himself on Snapchat sitting at Democratic Senator Jeff Merkley’s desk and was charged with trespassing and disorderly conduct.
  • Nicholas Moncada, 20, posted himself on Instagram from inside the Capitol and was arrested after college classmates tipped off the FBI.

It's not just selfies, of course. Other photos and videos from the siege have circulated widely and helped lead to arrests.

  • Video evidence of Peter Francis Stager, 41, shows him using an American flag to beat a DC police officer.
  • Robert Lee Sanford, 55, was caught on video throwing a fire extinguisher at Capitol Police.
  • Richard Barnett, 60, was arrested after posing for a photo lounging at a desk in House Speaker Nancy Pelosi’s office.

Be smart: The feds aren't saying so far whether any arrests or investigations have been helped along by facial recognition. The technology could prove valuable in fingering yet-to-be-identified rioters, but it raises serious concerns about privacy, ethics and accuracy.

  • Searches from controversial artificial intelligence firm Clearview AI searches have spiked 26% in the days following the Capitol riot, according to CNET
  • The FBI’s use of facial recognition to surveil Black Lives Matters protesters last summer drew outrage.

Yes, but: Some researchers, per Protocol, worry that outing rioters publicly via their social media uploads could also have a damaging effect, especially if they are wrongfully accused.

Go deeper

Capitol Police officer who died after pro-Trump riot will lie in honor

A vigil honoring United States Capitol Police Officer Brian Sicknick inside the U.S. Capitol on Jan. 28. Photo: Tasos Katopodis/Getty Images

Capitol Police officer Brian Sicknick, who died in early January from injuries sustained while responding to the siege on the Capitol by a pro-Trump mob, will lie in honor in the U.S. Capitol Rotunda, House Speaker Nancy Pelosi (D-Calif.) and Senate Majority Leader Chuck Schumer (D-N.Y.) announced Friday evening.

Why it matters: Lying in honor is a final tribute reserved only for private citizens who have rendered distinguished service to the nation, according to the Architect of the Capitol.

Updated 2 mins ago - Technology

3D printing's next act: big metal objects

Chief Scientist Andy Bayramian makes modifications to the laser system on Seurat's 3D metal printer. Photo courtesy of Seurat Technologies.

A new metal 3D printing technology could revolutionize the way large industrial products like planes and cars are made, reducing the cost and carbon footprint of mass manufacturing.

Why it matters: 3D printing — also called additive manufacturing — has been used since the 1980s to make small plastic parts and prototypes. Metal printing is newer, and the challenge has been figuring out how to make things like large car parts faster and cheaper than traditional methods.

Updated 1 hour ago - Technology

Mayors see cryptocurrency as a way to address income inequality

Illustration: Sarah Grillo/Axios

At the U.S. Conference of Mayors' meeting in D.C. this week, there's buzz around the idea of giving cryptocurrency accounts to low-income people.

Why it matters: Cities have been experimenting with newfangled ways to address income inequality — like guaranteed income programs — and the latest wave of trials could involve paying benefits or dividends in bitcoin, stablecoin or other digital currencies.