Did the Proud Boys help plan, lead the Capitol siege? Prosecutors are looking, and the video looks damning.

At least six members of the Proud Boys, a group of right-wing nationalist "Western chauvinists," have been arrested in connection with the Jan. 6 violent siege of the U.S. Capitol. Among those charged is Joseph Biggs, a Proud Boy leader who led about 100 men from former President Donald Trump's "Stop the Steal" rally to the Capitol.

Prosecutors and federal investigators are now trying to determine how closely the Proud Boys communicated during the siege and whether they planned the incursion in advance, The New York Times reports.

Investigators have recently turned their attention to two Proud Boy organizers on the West Coast, Ethan Nordean of Auburn, Washington, and Eddie Block from Madera, California, the Times reports, citing a federal law enforcement official. Nordean, also called Rufio Panman, has not been charged, and Block, who live-streamed the insurrection, told the Times that federal agents seized his electronic equipment on Friday. Investigator are also scrutinizing the role of Proud Boys chairman Enrique Tarrio, who was not at the riot because he had been banned from Washington, D.C., two days earlier.

Still, "despite having launched one of the most sprawling inquiries in American history, investigators have yet to unearth clear-cut evidence suggesting there was a widespread conspiracy to assault the Capitol," the Times reports. The Wall Street Journal made a pretty compelling case Tuesday that the Proud Boys were at least key instigators of the assault, based on a thorough review of video and social media posts.

The Proud Boys have publicly downplayed their involvement in the Capitol incursion. Tarrio told the Times a week after the siege that it was misguided and anyone who damaged the Capitol or assaulted police should be prosecuted. The handful of Proud Boys arrested after being filmed breaking into the Capitol, like Dominic Pezzola, "obviously, they didn't help our cause," he added.

Federal authorities as of Monday had charged about 150 of the more than 800 people who charged into the Capitol, and "it's likely not everyone will be tracked down and charged with a crime," The Associated Press reports. There were few arrests during the incursion, and "federal prosecutors are focusing on the most critical cases and the most egregious examples of wrongdoing." Some Capitol insurrectionists were turned in to the FBI by friends and family members, AP notes, but in dozens of cases, the rioters themselves "downright flaunted their activity on social media."

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