The booms heard were from police firing flashbang grenades, not commercial-grade fireworks.
The barriers between the Capitol and the vast masses of protestors on January 6, 2021, were minimal and mostly psychological.
Two interviews with pairs of protestors who claimed to have been at the initial breach of the Capitol, and been inside.
On 6 January, 2021, a largely peaceful protest of the fraudulent 2020 election brought hundreds of thousands to the Capitol from the initial Trump rally at the other end of the Mall.
President Trump supporters are organizing a WILDPROTEST for January 6th, in Washington, D.C. The time is short. Self-organization works. The Bill of Rights and Constitutional Government are at risk.