ISIS have threatened to attack this week's Champions League quarter-finals involving the likes of Manchester City, Arsenal, Real Madrid and Bayern Munich.
There are four fixtures in Europe's premier club competition on Tuesday and Wednesday, with City travelling to Real Madrid and Arsenal hosting Bayern Munich this evening.
PSG and Barcelona then lock horns on the same night that Atletico Madrid play Borussia Dortmund.
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But on Monday morning, the Al Azaim Foundation, the outlet responsible for submitting messages for the Islamic State, threatened to attack all stadiums.
They posted a frightening poster with a gunman and the names of the Parc des Princes, the Santiago Bernabeu, the Metropolitano Stadium and the Emirates Stadium.
The banner also contained the phrase, "Kill them all" as the terrorist group confirmed their violent intentions.
AS, via the Daily Mail, say that the Spanish Government have ramped up security measures for the two games taking place in Madrid.
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3,000 security experts will be present across the pair of midweek fixtures in the capital, where a combined total of 8,000 City and Dortmund fans are expected to be present.
The threat comes after Sarh al-Khilafah, a publication with links to ISIS, issued a threat to the recent game between Bayern and Dortmund at the Allianz Arena.
Although authorities concluded there was "no concrete evidence of danger", security presence was heightened for the game.
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Following on from the terror attack which claimed the lives of 143 people at Crocus City Hall in Moscow, German Interior Minister Nancy Faeser has said temporary border controls will be put in place for the upcoming Euro 2024 tournament in the country.
Featured Image Credit: GettyTopics: Arsenal, Manchester City, Real Madrid, Bayern Munich, Paris Saint-Germain