The US House of Representatives chamber in the Capitol is being fortified with bulletproof doors in wake of the deadly 6 January Capitol siege, Axios reported on Thursday.

The outlet's reporter spotted workers removing doors on an entrance to the gallery one level above the floor of the chamber, inside the Capitol building.

The workers said that the new doors are hardened with Kevlar, a material used in bulletproof vests and military helmets. There will be five sets of doors "directly onto the floor", and 15 into the gallery.

While the House is currently on a two-week break, it was said that the works will continue, even after the members come back.

A spokesperson for Speaker of the House Nancy Pelosi told Axios that the door project had been in the works before the Capitol siege.

The sun sets on the U.S. Capitol building, Thursday, March 4, 2021, in Washington.

The riot claimed five lives, including that of the Capitol police officer. The crowd of Trump supporters entered the building and vandalized multiple rooms, later storming into the Senate, where members of Congress, who were forced to evacuate, were earlier working in joint session to certify the results of the 2020 presidential election.