Suddenly, behind me, someone started to yell. A protester had discovered the undercover cops and shouted an alarm. Others began to join in, calling them pigs and telling them to go home. The two men passed me in silence, at a hurried pace. Suddenly, a scuffle erupted as one protester attempted to pull off one of the officer’s hoods. The officer tackled someone involved, and was quickly surrounded by a small crowd and kicked from several directions while on the ground. (That officer, who was African American, is who you see in the ground in the photo above.) The other officer stepped in front of his partner and brandished a baton. When the crowd did not back up he drew his gun, pointing at protesters and photographers. Moments later, police flooded the area, scattering marchers and blocking others, as the undercover officers arrested the man who had been tackled in the skirmish.