At least a couple of protesters were tackled to the ground and arrested before agents drove away from the crowd of at least 30 protesters and observers, some of whom were coughing or vomiting from the smoke, according to witnesses.

Observers took images of a loaded rifle magazine that an agent dropped in the snow and left behind. The magazine was reported and later recovered by the Minneapolis Police Department, a department spokesperson confirmed.

Luhmann took video of one of the empty smoke canisters, which is labeled as “pocket tactical green smoke,” made by the company Defense Technology. The back states that it should be used only by “trained law enforcement, correctional or military personnel.”

Below that, it states that anyone using the canister “should be trained in deployment, decontamination and first aid procedures.”