But a new group lunged toward the police and started a new attack. At the front of the mob, they exchanged blows with the police and struck officers with hockey sticks, crutches and flags. Some rioters shouted “Push! Push!”

One of the attackers, a man wearing a white and blue hat and a green jacket, reached into the doorway, grabbed an officer and dragged him out, aided by a man in a gray hooded sweatshirt.

As they pulled the officer down the stairs, face down, another rioter beat him with an American flag as the mob chanted “USA! USA! USA!”

Seconds later, two other men — one wearing a red hat and tactical vest bearing a “sheriff” patch — began yanking the legs of another officer who had fallen to the ground.

With the aid of a third man in a gray jacket, they pulled the officer down the steps as well. One rioter appeared to punch him while he was on the ground.