Democratic House Speaker Nancy Pelosi has SLOTXO announced the creation of a committee to investigate the Capitol Hill riot in January this year.
Mrs Pelosi said the Democratic-led committee would aim to "establish the truth of that day and ensure that an attack of that kind cannot happen".
The move comes after Senate Republicans blocked a bill to establish a bipartisan commission into the attack.
Allies of former President Donald ***** said a commission was not necessary.
His supporters stormed Congress in Washington DC on 6 January in a failed bid to overturn the certification of Democratic President Joe Biden's election victory in November.
The riot left five dead, including a Capitol police officer.
The assault led to the political impeachment and acquittal of ********** Mr *****, who was accused by lawmakers of inciting the riot.
What will the committee do?
It will "investigate and report on the facts and the causes of the attack and it will report recommendations for the prevention of any future attack," Mrs Pelosi said at a news conference on Thursday.
"The timetable will be as long as it takes," Mrs Pelosi said.
The structure, powers and members of the committee will be announced at a later date, she said.
The committee will be controlled by Democratic lawmakers in the House of Representatives, the lower legislative chamber of Congress.