Twitter's Carlos Monje, the director of public policy and philanthropy, right, knocks on the door with Colin Crowell, head of global public policy, to enter the closed door meeting with the House Intelligence Committee on Capitol Hill, Thursday, Sept. 28, 2017 in Washington. Officials from Twitter are on Capitol Hill as part of the House and Senate investigations into Russian interference in the 2016 elections. (AP Photo/Alex Brandon)
Twitter's Carlos Monje, the director of public policy and philanthropy, right, knocks on the door with Colin Crowell, head of global public policy, to enter the closed door meeting with the House Intelligence Committee on Capitol Hill, Thursday, Sept. 28, 2017 in Washington. Officials from Twitter are on Capitol Hill as part of the House and Senate investigations into Russian interference in the 2016 elections. (AP Photo/Alex Brandon) Credit: Alex Brandon

San Francisco — Twitter said on Thursday it had shut down 201 accounts that were tied to the same Russian operatives who posted thousands of political ads on Facebook, but the effort frustrated lawmakers who said the problem is far broader than the company appeared to know.

The company said it also found three accounts from the news site RT — which Twitter linked to the Kremlin — that spent $274,100 in ads on its platform in 2016.

Despite the disclosures, Sen. Mark Warner, D-Va., questioned whether the company is doing enough to stop Russian operatives from using its platform to spread disinformation and division in U.S. society.

Warner said Twitter’s presentation to a closed-door meeting of Senate Intelligence Committee staffers Thursday morning was “deeply disappointing” and “inadequate on almost every level.” Twitter also made a presentation to House Intelligence Committee staffers in the afternoon.

The company “showed an enormous lack of understanding … about how serious this issue is, the threat it poses to democratic institutions,” said a visibly frustrated Warner.

The meetings between the company and congressional investigators were part of a widening government probe into how Russian operatives used Facebook, Twitter, Google and other technology platforms to widen fissures in the United States and spread disinformation during the 2016 campaign. Those companies have come under increasing pressure from Capitol Hill to investigate Russian meddling and are facing the possibility of new regulations that could impact their massive advertising businesses.

The Washington Post reported this week that some of the 3,000 Facebook ads bought by Russian operatives promoted African American rights groups, including Black Lives Matter. Those ads were targeted at users in specific locations such as Ferguson, Mo., and Baltimore, two cities that have faced violent protests over police shootings of black men.

Ads aimed at voters in other regions, meanwhile, suggested that the same groups posed a rising political threat.

Other ads featured Muslims supporting Democrat Hillary Clinton for president and were targeted at Facebook users who might fear Muslims.

Facebook, Google and Twitter are being summoned to a public hearing before the Senate Intelligence Committee on Nov. 1.

The Twitter accounts, which were taken down over the past month, were associated with 470 accounts and pages that Facebook this month said came from the Internet Research Agency, a Russia-connect troll farm.

Twitter said the groups on Facebook had 22 corresponding Twitter accounts. Twitter then found an additional 179 accounts linked to those 22.

But lawmakers and analysts criticized Twitter for appearing to have accepted and looked into only the data that it had received from Facebook, rather than conducting a broader internal investigation.