(From L to R) Princess Charlene of Monaco, Princess Alexandra, Prince's Albert II of Monaco observe a minute of silence on November 16, 2015 at the Monaco Palace in Monaco on November 16, 2015 to pay tribute to victims of the attacks claimed by Islamic State which killed at least 129 people and left more than 350 injured on November 13.  AFP PHOTO / VALERY HACHE        (Photo credit should read VALERY HACHE/AFP/Getty Images)