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Police in Iran have arrested a man accused of murdering his 14-year-old daughter in a so-called honour killing that has sparked widespread outrage.

Romina Ashrafi ran away from home in Gilan province with her 35-year-old boyfriend after her father objected to their marriage, local media said.

The pair were found by police and Romina was sent home despite reportedly telling them she feared for her life.

Last Thursday night, she was allegedly attacked by her father in her bedroom.

, and that afterwards the father walked outside the house "with the sickle in his hand and confessed".

On Wednesday, a number of national newspapers highlighted Romina's story on their front pages.

"Insecure paternal home", read the headline in the pro-reform Ebtekar, which lamented the failure of existing legislation to protect women and girls.

Meanwhile, the Persian hashtag has been used more than 50,000 times on Twitter, with most users condemning the killing and the patriarchal nature of Iranian society in general.

Shahindokht Molaverdi, a former vice-president for women and family affairs and the current secretary of Iran's Society for Protecting Women's Rights, wrote:

She added that such murders would continue "as long as the law and dominant cultures in local and global communities are not deterring enough".

Iran's Islamic penal code reduces punitive measures for fathers and other family members who are convicted of murder or physically harming children in domestic violence or "honour killings".

What is an 'honour killing'?

It is the killing of a member of a family who is perceived to have brought dishonour upon relatives.

Pressure group Human Rights Watch says the most common reasons are that the victim:

But killings can be carried out for more trivial reasons, like dressing in a way deemed inappropriate or displaying behaviour seen as disobedient.

If a man is found guilty of murdering his daughter in Iran, the punishment is between three and 10 years in prison, rather than the normal death sentence or payment of diyeh (blood money) for murder cases.

There are no statistics on the prevalence of "honour killings" in Iran, but , particularly among rural and tribal populations, according to the US state department.