English fans descending on Porto for the Champions League final were involved in violent clashes on Thursday night.
Video footage shows a number of different skirmishes by the Douro river and supporters are said to have locked horns with the local police after the bars closed at 10.30pm.
Local television in Porto showed footage of various incidents with Chelsea and Manchester City fans arriving ahead of Saturday night's huge game.
Chelsea and Manchester City supporters are alleged to have violently clashed with police
Desacatos entre adeptos do Manchester City e do Chelsea no Porto.