Real Betis fans fought with riot police as ugly scenes marred the end of Manchester United's 4-1 Europe League win.
Five minutes before the end of the last-16 clash, a section of the away end appeared to try and break into the home stand by climbing over the barrier separating supporters. Police were quick to intervene amid reports seats were being pulled up and thrown by some fans.
Video footage taken by United supporters and posted to Twitter showed a line of riot police staying guard on the Betis side of the barrier and holding fans back, with scuffles breaking out.