The US House of Representatives chamber in the Capitol is being fortified with bulletproof doors in the wake of the deadly January Capitol 6 riot.

According to Axios, workers were removing the original doors on an entrance to the gallery one level above the floor of the House of Representatives and began replacing them with bulletproof ones. 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 would 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 Capitol riot on January 6 saw a mob of former President Donald Trump’s supporters stormed into the House and Senate, where members of Congress were earlier working in joint session to certify the results of the 2020 presidential election. The riot claimed five lives, including that of a Capitol police officer.