The United Nations has expressed “outraged” after armed men arrested a prominent Sudanese women’s rights campaigner in a night-time raid on her home in Sudan on Saturday night. Around 15 masked men allegedly detained Amira Osman after storming her house in Sudan’s capital Khartoum her sister Amani Osman told Reuters on Sunday. This comes after a series of arrests conducted by Sudanese security forces – including the detention of opposition politicians and journalists covering pro-democracy protests \- as activists say there has been a campaign of arrests of pro-democracy figures since the 25 O…