Tehran's police chief says the death of a woman in custody was an "unfortunate" incident and they don’t want it to be repeated.
Mahsa Amini, 22, an Iranian woman, fell into a coma last week, hours after morality police held her for allegedly breaking hijab rules.
Witnesses accused officers of beating her, but Police Brig-Gen Hossein Rahimi denied such accusations marking it "cowardly act".
Her death sparked protests in the capital and western Iran, where two people were reportedly killed in clashes with riot police on Monday.
Videos posted on social media showed protests in the capital, where women removed their headscarves and shouted "death to the dictator" - a chant often used in reference to the Supreme Leader, Ayatollah Ali Khamenei.
Ms Amini, an ethnic Kurd who was from the western city of Saqez in Kurdistan province, died in hospital on Friday after spending three days in a coma.
She was detained outside a metro station in Tehran on Tuesday by morality police. They accused her of breaking the law requiring women to cover their hair with a headscarf, and their arms and legs with loose clothing.
According to witnesses, she was beaten while inside a police van that took her to a detention centre.
Police rejected the allegation and said she suffered "sudden heart failure" while waiting with other women at the facility to be "educated".
Bd-pratidin English/Lutful Hoque
