SUZAN FRASER, Associated Press ANKARA, Turkey (AP) — The trial of 28 people accused of roles in the assassination of Russia's ambassador to Turkey opened Tuesday in Ankara, among them a U.S.-based Muslim cleric whom Turkey blames for a failed coup the same year. An off-duty police officer, Mevlut Mert Altintas, fatally shot Russian Ambassador Andrei Karlov at a photo exhibition in the Turkish capital