Turkish President Tayyip Erdogan said Tuesday that his government is considering the possibility of revoking the citizenship of Turks who support the PKK Kurdish underground, adding that there is "nothing to discuss with terrorists." He spoke at a conference one day after rejecting the possibility of negotiating with the PKK, and after an incident in which two policemen were killed in a roadside bomb attack. He said supporters of terror, "like a wolf in sheep's clothing, they serve the same purpose as the members of the terror organization. As a nation we need to be careful. No one must commit treachery against the state and the nation behind our backs."