ISTANBUL (AP) — Hundreds of protesters gathered outside the Istanbul office of an opposition newspaper Friday, accusing the government of silencing critics and attempting to cover-up a scandal after two journalists were jailed on terror and espionage charges for their reports on alleged Turkish arms smuggling to Syria.Cumhuriyet newspaper's editor-in-chief Can Dundar, and the paper's Ankara representative, Erdem Gul, were sent to a prison in Istanbul late on Thursday, accused of willingly aiding a terror organization and revealing state secrets.The incident comes amid deepening concerns over media freedoms in Turkey, which aspires to join the European Union.In May, the paper published what it said were images of Turkish trucks carrying ammunition to Syrian militants.The images reportedly date back to January 2014, when local authorities searched Syria-bound trucks, touching off a standoff with Turkish intelligence officials.