US, Italian, and Belgian authorities learn more about extremist networks in Europe by monitoring operatives connected to a cell of radicals centered on the Islamic Cultural Institute in Milan, Italy, some members of which appear to have foreknowledge of 9/11 (see August 12, 2000 and March 2001). A man named Tarek Maaroufi, who is under surveillance in Belgium, arrives in Milan and calls another extremist known as Sami Ben Khemais, whose phone is being monitored by Italian authorities and who collects Maaroufi from the airport. Around the same time US intelligence notifies the Italians that Ben Khemais is to be joining three bin Laden-related individuals in Italy and that there are vague plans to attack US targets there. The warning signs of an attack mount, and the US embassy in Rome is even closed for a day. Ben Khemais travels to Spain, where he is monitored by the local authorities and links up with other Islamic extremists, but is arrested along with four others when he returns to Italy. Maaroufi is also arrested. According to the Italians, they had plotted an attack in Strasbourg around Christmas 2000, together with a German cell that is also arrested (see December 25-26, 2000). [Chicago Tribune, 10/22/2001]