Borussia Dortmund's Yellow Wall - in pictures

A fan cheers on her team from the Yellow Wall at Signa Iduna Park, Dortmund. Borussia Dortmund FC was founded in 1909 Photograph: Gary Calton for The Guardian

Police congregate at the stadium, which is the largest in Germany Photograph: Gary Calton for The Guardian

Borussia Dortmund chief executive Hans-Joachim Watzke speaks to the media Photograph: Gary Calton for The Guardian

Younger age-group players line up on the touchline Photograph: Gary Calton for The Guardian

The Yellow Wall falls silent for the first 12 minutes and 12 seconds of a match against Dusseldorf Fortuna, in protest against planned security proposals Photograph: Gary Calton for The Guardian

The Yellow Wall, seen after their silent protest Photograph: Gary Calton/Gary Calton

Manager Jurgen Klopp speaks with the media before the game Photograph: Gary Calton for The Guardian

A fan displays his collection of commemorative scarves. The club's motto is Echte Liebe, which translates as 'True Love' Photograph: Gary Calton for The Guardian

A fan leads the chants from the Yellow Wall. Dortmund's success in the Uefa Cup Winners' Cup in 1966 made them the first German club to win a European title Photograph: Gary Calton for The Guardian

The Yellow Wall, or Die Gelbe Wand, is the largest free-standing grandstand in Europe, with a capacity of 25,000 Photograph: Gary Calton for The Guardian