Burning...

During demonstrations in downtown Portland, Oregon, protesters blocked traffic on Main Street and launched fireworks from the street, injuring officers, the Portland Police Bureau said in a Sunday statement.

The Saturday police protests began peacefully, police said, with people gathering in two public plazas to watch and listen to performers, but some in the group began launching fireworks on Southwest Main Street, the statement said.

The crowd also blocked traffic and launched "commercial-grade fireworks" toward the justice center and at the nearby federal courthouse, police said. The protesters ignored warnings from the actual police sound truck urging them to stop shooting fireworks at the buildings, they said.

Protesters burned an American flag.

And burning the flag message is what exactly?  ...