Small pockets of fighting reportedly broke out while Borussia Dortmund fans queued to buy tickets for their club's Champions League semi-final tie against Real Madrid.

Hoards of Dortmund fans are believed to have spent two nights to get a good spot in the queue outside the Bundesliga club's offices for much sought-after tickets.

Reports from local newspaper Ruhr Nachrichten have claimed that Dortmund fans lashed out at ticket scalpers, who tried to jump the queue, according to the Daily Mail.

All 66,829 tickets for Wednesday's first leg of the semi-final in Dortmund have been sold.