Col. Hugh Clements of the Providence Police Department said Tuesday an officer suffered minor injuries after being struck in the head by either a bottle or a firework during a rally that was supposed be in support of an injured scooter driver. Commissioner Steven Pare said a K-9 was also hit but is expected to be OK. The officer was treated by the fire department on scene. Pare told NBC 10 News 19 people were arrested, including a juvenile.