Increased security measures are being implemented for tonight's Champions League matches after ISIS released a poster threatening to target all four quarter-final venues.
The Al Azaim Foundation, a mouthpiece for ISIS, issued a chilling image featuring the names of the four stadiums alongside the message "Kill them all."
The group listed London's Emirates Stadium, Paris's Parc des Princes, and the Santiago Bernabéu and Metropolitano arenas in Madrid as targets.
Arsenal will be facing Bayern Munich at the Emirates Stadium tonight; and Real Madrid will play Manchester City at Santiago Bernabéu.