HARARE (Reuters) - Zimbabwean police on Friday charged an American citizen with a new offence of plotting to overthrow a constitutionally elected government, her lawyer said. Martha O Donovan, who works for Magamba TV, which describes itself as Zimbabwe s leading producer of political satire, had earlier been charged over a tweet that appeared to insult President Robert Mugabe. In a statement to police, O Donovan denied the allegations against her as  baseless and malicious .  
Zimbabwe accuses American citizen of trying to overthrow government: lawyer