Syrian state television on Wednesday broadcast an interview with a young woman who Amnesty International last month reported as killed by the security forces, DPA reported.
The woman said she was 18-year-old Zeinab al-Hosni, from the city of Homs, the site of some of the most violent protests against the continued rule of President Bashar al-Assad.
Amnesty said last month that al-Hosni's mutilated body was discovered by chance when her family was at the morgue in Homs to identify her brother's corpse.
"My death was fabricated to serve foreign interests," the woman in Wednesday's interview said, showing her identity card.
"I came today to the police to say the truth. I am alive in contrast to what the lying satellite television stations said," she said.
She said she ran away to live with relatives after being abused by her brothers, and had not told her family she was alive.
Syrian activists said on the social networking website Facebook that the interviewed woman was a lookalike.
It is impossible to verify news from Syria as the authorities have banned foreign journalists and human rights organizations.
Amnesty said al-Hosni was abducted in July to pressure the family to hand over her activist brother to the authorities.
Amnesty said her brother was arrested and executed, and al-Hosni was also killed, bringing the number of deaths in custody since the beginning of the unrest of 103.
Syria has been gripped by an uprising against the regime of al-Assad since mid-March. The UN has estimated that 2700 people have died in the brutal crackdown by the government forces against pro-democracy protesters.