Several Russians connected to the Kremlin attended events in Washington, D.C., on Inauguration Day last year, drawing the FBI's attention, The Washington Post reported Saturday.

Counterintelligence officials with the FBI reportedly expressed concerns about some of the half-dozen Russians, given the ongoing investigation into possible collusion between President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's campaign and Moscow.

According to the Post, the event attendees included Viktor Vekselberg, a businessman who is friendly with Russian President Vladimir Putin; Boris Titov, a politician running for president of Russia and Natalia Veselnitskaya, a lawyer who attended a June 2016 meeting with Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE at Trump Tower.

ADVERTISEMENT

Veselnitskaya, who Trump Jr. said claimed to have damaging information on Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE, attended a party hosted by Rep. Dana Rohrabacher Dana Tyrone RohrabacherDemocrat Harley Rouda advances in California House primary Lawyers to seek asylum for Assange in France: report Rohrabacher tells Yahoo he discussed pardon with Assange for proof Russia didn't hack DNC email MORE (R-Calif.), the newspaper reported.

Titov, meanwhile, told the Post that he attended several receptions, including a ball where the president danced.

Special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE is leading a criminal investigation into Russia's election meddling and possible collusion between the Trump campaign and Russia. So far, his probe has led to two indictments and two guilty pleas.

Former Trump campaign chairman Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE and Manafort's former associate, Richard Gates, were indicted on money laundering and tax fraud charges.

Former national security adviser Michael Flynn and former Trump campaign adviser George PapadopoulosGeorge Demetrios PapadopoulosTale of two FBI cases: Clinton got warned, Trump got investigated Trump says he would consider pardons for those implicated in Mueller investigation New FBI document confirms the Trump campaign was investigated without justification MORE pleaded guilty to lying to the FBI.

Trump has repeatedly claimed there was no collusion, calling Mueller’s investigation a “witch hunt.”

Multiple congressional committees are conducting separate investigations into Russian interference in the 2016 election.