A committee investigating the US Capitol insurrection has issued subpoenas to five more individuals, including former president Donald Trump’s ally Roger Stone and conspiracy theorist Alex Jones.

The subpoenas on Monday (local time) include demands for documents and testimony from Mr Stone and Mr Jones, as well as three people accused of organising and promoting the two rallies that took place on January 6.

“The Select Committee is seeking information about the rallies and subsequent march to the Capitol that escalated into a violent mob attacking the Capitol and threatening our democracy,” Mississippi Representative Bennie Thompson, the Democratic chairman of the panel, said.

“We need to know who organised, planned, paid for, and received funds related to those events, as well as what communications organisers had with officials in the White House and Congress.”

Mr Stone was convicted in special counsel Robert Mueller’s Russia investigation of lying to Congress about his efforts to gather inside information about Russia-hacked Democratic emails that were published by WikiLeaks in the run-up to the 2016 presidential election. He was subsequently pardoned by Mr Trump.

The House subpoena notes that Mr Stone spoke at rallies on the day before the Capitol insurrection and used members of a far-right group, the Oath Keepers, as personal security guards while he was in Washington.

The House panel also wanted to hear from Mr Jones, with Mr Thompson saying that the conspiracy theorist and talk-show host helped organise the rally at the Ellipse before the insurrection.

The letter from Mr Thompson said Mr Jones repeatedly promoted Mr Trump’s claims of election fraud, urged his listeners to come to Washington for the rally and marched from the Ellipse to the Capitol.

The other three subpoenas were issued to Dustin Stockton, Jennifer Lawrence and Taylor Budowich for their alleged involvement in the promotion and organisation of the series of rallies following the 2020 presidential election that promoted false information regarding the election results, including the Ellipse rally that preceded the violent attack on the Capitol.

The results of the election were confirmed by state officials and upheld by the courts. Mr Trump’s own attorney-general William Barr had said the Justice Department found no evidence of widespread fraud that could have overturned the results.

The committee is seeking information from Mr Stockton and his fiance, Ms Lawrence, who it says were involved in organising some of the rallies.

The committee alleges Mr Stockton was concerned enough that the Ellipse rally would lead to “possible danger” that he escalated those concerns to then-White House chief of staff Mark Meadows.

The panel has already demanded documents and testimony from several other Mr Trump advisers – some have cooperated and some have not. Steve Bannon, a long-time ally of Mr Trump, was indicted on November 12 on two counts of criminal contempt of Congress after he defied a subpoena from the House committee.

The subpoenas issued on Monday are the latest in a wide net the House panel has cast in an effort to investigate the deadly day when a group of Mr Trump’s supporters, fuelled by his false claims of a stolen election, brutally assaulted police and smashed their way into the Capitol to interrupt the certification of Democrat Joe Biden’s victory.

The committee has already interviewed more than 150 people across government, social media and law enforcement, including some former Trump aides who have been cooperative.

The panel has subpoenaed more than 20 witnesses. Most of them, including several associates who helped plan the massive “Stop the Steal” rally on the morning of January 6, have signalled they will cooperate.

-AAP