Rwanda has arrested a newspaper editor on charges of genocide denial and stirring ethnic hatred less than a month ahead of August's presidential election, Reuters quoted police as saying on Saturday. Agnes Uwimana, who has already served a one year jail term for inciting ethnic divisions and defamation, was arrested on Thursday evening following the publication of an article comparing President Paul Kagame to Hitler, said police spokesman Eric Kayiranga. "There are four charges. They are inciting hatred in public, genocide denial, discrimination and sectarianism. She has been warned several times and she refused to change," he said. Two other critical newspapers were suspended in April on similar charges. Rights groups and major donors have in recent weeks expressed concerns about the increasingly repressive environment ahead of the presidential pol -- SPA