TAREK AMARA THREE prominent opponents of Tunisian President Kais Saied said that they had received notices from prosecutors that they were under investigation, including one related to assaulting public security and insulting the president. Days ago Saied had warned that judicial actions must be taken against those who defame the "symbols of the state", considering that as an attack on state security. The activists are Nejib Chebbi, Reda Belhaj and Ayachi Hammami. Chebbi is the leader of the opposition Salvation Front and has organized regular protests against Saied for months. The justice ministry was not immediately available for comment. Saied…