Gunman opens fire on Turkey president Erdogan's office.

          A man opened fire and threw a grenade which did not explode, Thursday at the Instabul offices of Turkey's president Recep Tayyip Erdogan, report said. The man was arrested immediately after the attempted attack, CNN-Turk reported. It was not clear whether Turkey President was present at the time of the accident. The unidentified gunman was armed with a pistol, rifle and homeland bomb. Report from NTV news said the police destroyed the grenade in a controlled explosion. It wad not clear what motivated the  gunman to attempted to kill a president.