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The 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 detainedÌý after storming her house in Sudan's capital Ìýher sister Amani Osman told Reuters on Sunday.

This comes after a conducted by Sudanese security forces - including the detention of opposition politicians and - as activists say there has been aÌýcampaign of arrests ofÌýpro-democracy figures since the 25 October military coup.

"Amira’s arrest & pattern of violence against women’s rights activists severely risks reducing their political participation in Sudan, we call for her release... Authorities must respect [the] right to freedom of assembly," theÌýUN Integrated Transition Assistance Mission in Sudan tweeted on Sunday morning.

Outraged by arrest of women’s rights advocate Amira Osman overnight
Amira’s arrest & pattern of violence against women’s rights activists severely risks reducing their political participation in Sudan, we call for her release Authorities must respect right to freedom of assembly

— UN Integrated Transition Assistance Mission Sudan (@UNITAMS)

"We don't know where she [Amira]Ìýis or the security agency that took her. We are worried about the nature of her arrest and her critical health condition," the activist's sister said.Ìý

Osman campaigned for women's rightsÌýunder the rule of former President Omar Al-Bashir - a longtime autocrat for crimes against humanity - who was ousted during a 2019 uprising against him.

The activist was previously arrested in 2013 for refusing to wear a headscarf.

Osman was also convicted andÌýfined in 2002 for "wearing trousers" - seen as "immodest" attire by the authorities who prosecuted her, according to Reuters.

Ìýafter former Prime Minister Abdallah Hamdok's resignation left the military in powerÌýjust over two months after their coup and aÌý, which sawÌýsecurity forcesÌýÌýat least 63 civilians.