Videos on social media showed people throwing tables, chairs and bottles before riot police arrived.
The Three Lions are among the favourites to triumph but have a new-look squad in Germany
Slovenia 1-1 Denmark: Three years after collapsing in his nation’s opening Euros game, the midfielder scored to earn the Danes a point in Group C
Slovenia 1-1 Denmark: Christian Eriksen scored a goal that tugged on the heartstrings in his first Euros appearance since collapsing on the pitch but Denmark could only earn a point