I suspect it was just fire hoses but it makes little difference to the people facing the water jets Many sources conflate the two For a picture of firemen not policemen using the hoses see here For another picture captioned water cannon see here  but remember that the reporters often in fact invariably dont write the picture captions  that is often done after the reporter has filed the story Ill change our caption to highpressure water jet which leaves vague what is producing the water jet