WASHINGTON >> Months after requesting documents from more than a dozen social platforms, the House committee investigating the Capitol insurrection has issued subpoenas targeting Twitter, Meta, Reddit and YouTube after lawmakers said the companies’ initial responses were inadequate.

The committee chairman, Rep. Bennie Thompson, demanded records today from the companies relating to their role in allegedly spreading misinformation about the 2020 election and promoting domestic violent extremism on their platforms in the lead-up to the insurrection on Jan. 6, 2021.

“Two key questions for the Select Committee are how the spread of misinformation and violent extremism contributed to the violent attack on our democracy, and what steps — if any — social media companies took to prevent their platforms from being breeding grounds for radicalizing people to violence,” Thompson, D-Miss., said in the letter.

Thompson added that it’s “disappointing that after months of engagement,” the four companies have not voluntarily turned over the necessary information and documents that would help lawmakers answer the questions at the heart of their investigation.

In his letter, Thompson outlined the way the companies were complicit in the deadly insurrection perpetrated by supporters of Donald Trump and far-right groups.

YouTube, owned by Alphabet, was the platform where a significant amount of communication took place “relevant to the planning and execution” of the siege against the Capitol, “including livestreams of the attack as it was taking place,” the letter stated.

The committee stated how Meta, formerly known as Facebook, was reportedly used to exchange hateful, violent and inciting messages between users as well as spread misinformation that the 2020 presidential election was fraudulent in an attempt to coordinate the “Stop the Steal” movement.

On Reddit, the r/The—Donald “subreddit” community grew significantly, the letter said, before members migrated to an official website where investigators believe discussions around the planning of the attack were hosted. A spokesperson for Reddit said Thursday that the company had received the subpoena and “will continue to work with the committee on their requests.”

The letter outlined how Twitter was warned about the potential violence that was being planned on its platform in advance of the attack and how its users engaged in “communications amplifying allegations of election fraud, including by the former President himself.”

The letter highlighted one specific tweet from Trump on Dec. 19, 2020: “Statistically impossible to have lost the 2020 Election” as he urged followers to come to Washington to engage in a “wild” protest on Jan. 6, 2021.

A spokesperson for Twitter declined to comment on the subpoenas. Representatives for Meta and Alphabet did not immediately respond to messages seeking comment.

The committee made its initial request for the documents from 15 social media companies in August, which also included TikTok, Parler, Telegram, 4chan and 8kun.

The subpoenas come as the nine-member committee continues its wide-reaching investigation into how a mob was able to infiltrate the Capitol and disrupt the certification of Democrat Joe Biden’s presidential victory, in what was the most serious assault on Congress in two centuries.

The committee of seven Democrats and two Republicans has interviewed more than 340 people and issued dozens of subpoenas to those in Trump’s inner circle, including his former chief of staff, as well as requests to their own colleagues in the House.

On Wednesday, the committee requested an interview with House Minority Leader Kevin McCarthy, R-Calif.

McCarthy as well as GOP Reps. Jim Jordan of Ohio and Scott Perry of Pennsylvania have denied the committee’s request to sit down for interviews or turn over documents related to their conversations on Jan. 6, 2021, with Trump or those close to him as hundreds of his supporters beat police, stormed the building and interrupted the certification of the 2020 election.