Police officers stand guard as supporters burn flares outside the Metropolitano stadium, ahead of the Champions League quarterfinal first leg soccer match between Atletico de Madrid and Dortmund in Madrid, Spain, Wednesday, April 10, 2024. This week's Champions League soccer games will go ahead as scheduled despite an Islamic State terror threat. A media outlet linked to the terror group has issued multiple posts calling for attacks at the stadiums hosting quarterfinal matches in Paris, Madrid and London. (AP Photo/Andrea Comas)