Terrorist group, Islamic State, has threatened to launch an attack against the four stadiums hosting the first leg of the Champions League quarter-finals.
The fixtures are scheduled for this week Tuesday and Wednesday.
Daily Mail quoted the Al Azaim Foundation, a media outlet that is responsible for spreading messages from the Islamic State (Daesh, ISIS), to have confirmed their intentions with a poster.
The foundation, with the message, ‘Kill them all’, shared an image threatening to attack the Parc des Princes, the Santiago Bernabeu, the Metropolitan and the Emirates Stadium,
This came shortly after the ISIS-affiliated media outlet Sarh al-Khilafah announced their plan to attack the fans who were at the Allianz Arena in Munich to watch the match between Bayern Munich and Borussia Dortmund.
Arsenal host Bayern Munich on Tuesday night, at the same time as City’s match in Madrid.
On Wednesday, Paris St-Germain meet Barcelona in France, while Atletico Madrid host Borussia Dortmund.
Meanwhile, the Spanish government has launched an extensive security operation ahead of Manchester City’s Champions League match against Real Madrid.
The authorities in Madrid have activated all of their “alert” and “response systems”, according to reports in Spain.
Spain’s interior ministry has designed an operational deployment in which more than 2,000 National Police agents and also Civil Guard officers are involved with additional back-up from Madrid’s municipal police force.
The security plan is part of the anti-terrorism measures in Spain, where the current alert level is four out of five.