BT Sport were forced to apologise for what a section of Borussia Dortmund fans did while watching their side take on Chelsea in the Champions League round-of-16. Supporters were keen to show their support for the German outfit by letting off a number of yellow smoke bombs at the start of the match.
This created quite a sight for those watching on from home, with the sandstorm effect making it difficult to see much of the action. Due to the poor quality of picture, commentator Darren Fletcher apologised to viewers at the top of the broadcast.
This action came despite a warning from Chelsea about what would happen to anyone who attempts to bring a pyrotechnic device into Stamford Bridge. On their website, a statement reads: "If you are found to be in possession of a pyrotechnic device either on the street or at the stadium, you will be arrested.
