By Sofia Menchu GUATEMALA CITY (Reuters) – Guatemalan authorities arrested a well-known local journalist on accusations of money laundering and blackmail, according to a prosecutor in charge of the case, a move that has sparked outrage among human rights activists. Jose Ruben Zamora Marroquin, an outspoken government critic, was detained Friday night, said Rafael Curruchiche, head of the Special Prosecutor’s Office Against Impunity (FECI) on social media, after police raided his home and office earlier. Speaking from a cell in a video posted to Twitter on Saturday by a journalist for local new…