A huge pro-Palestinian banner shown during the Champions League match between Paris Saint-Germain and Atletico Madrid on Wednesday has caused outrage in France. “I will demand explanations from Paris Saint-Germain, this is unacceptable” French Interior Minister Bruno Retailleau told Sud Radio on Thursday. “The rules of football, the (European football ruling body) UEFA rules, prohibit political messages,” he added. A few minutes before the start of the match at the Parc des Princes, PSG fans unfurled a banner with the words “Free Palestine” and the slogan “War on the pitch, but peace in the wo…