TEHRAN -- Police forces shot the attacker of Tehran subway station dead on Saturday morning, Hadi Tamhidi, the governor of Shahr-e-Ray district in the south of Iran's capital Tehran, said.On the day, a person attacked a cleric with a knife in the Shahr-e-Ray subway station and injured him. The cleric was transferred to the hospital, Tamhidi told state IRIB TV.In the attack, another person who helped the cleric, was injured by the attacker, he said.The assailant, who had been injured by the police fire, died later, he added.After a halt in the operation of subway station for a period of time, the gates were opened and the situation turned back to its normal status, Tamhidi said.The identity of the assailant has not been revealed, and there has been no report about the terrorist intentions in the attack so far.