Islamic State terrorist group threatens an attack in the stadiums of the Champions League. "Kill them all," says the message spread by The Foundation, the media that publishes the messages of the terrorist group.

The situation set off alarm bells among UEFA authorities. The Parque de los Príncipes, the Santiago Bernabéu, the Metropolitano and the Emirates Stadium will host the quarterfinals of the UEFA Champions League this year. The group that carried out the latest attack at Moscow's Crocus City Hall.