Village elders in Pakistan ordered the rape of a 17-year-old girl after her brother was accused of raping another girl.

Twenty people have been arrested by police following the two assaults, which took place last week in the town of Muzaffarabad, close to Multan in south Pakistan, police said, on Thursday.

The mother of the first victim, who is aged 12, told police her daughter was cutting grass in a field when she was raped by a man.

The 12-year-old reported the rape to her mother, who then complained to village elders.

After deliberating, the elders declared one of the sisters of the first attacker would be raped in retaliation for the crime, according to the police report.

A view of a room where a Pakistani teenage girl was raped in Muzaffarabad, taken on July 26.

“(The second victim)’s two elder sisters were initially called, but the elders decided that (17-year-old) Victim B would be the one to take the punishment,” the police report said.

“Her mothers and sisters all protested this but the elders brought out their guns and threatened to kill them.”

Muzaffarabad Station House officer Rashid Faheem told CNN investigations were still underway, with more raids expected.

Salman Sufi, director of the Violence Against Women Center in Multan, told CNN both mothers and their daughters had come to his center after the attacks took place.

He said the second victim had arrived with her mother on the July 19, three days before the 12-year-old victim and her mother also came for help.

“Medical examinations have been conducted on both of them and they have confirmed that both girls were raped,” Sufi said.

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A Pakistani villager points to a house where a teenage girl was raped in Muzaffarabad, taken on July 26.

Sufi said the center had only been opened in March and liaised directly with police to provide assistance to victims, including counseling.

“Since March 2017, in the four months since the center was formed, it has received and resolved 38 cases of rape in this region alone,” he said.

The director asked that the victims’ names not be released. “The Punjab government will make sure that this case will go to court and that justice will be done,” Sufi said.

It is not the first time a woman has been raped as a form of punishment in Pakistan.

In 2002 then-28 year old Mukhtar Mai was gang raped on the orders of a tribal court — a jirga — after her brother was accused of having a sexual relationship with an older woman in another tribe.

He was later found to have been wrongly accused by the Punjab governor.

“First of all, there was the rape, and afterwards when I tried to call the police, I received death threats that I would be killed if I went to a police station,” Mai told CNN in 2013.

Her rapists were originally sentenced to death, but that was later overturned by Pakistan’s Supreme Court.

Human rights groups have regularly accused the Pakistani government of not doing enough to protect women and girls from abuses in the country, including rape, honor killings and acid attacks.

In July 2016, Pakistani social media Qandeel Baloch was killed by her brother who believed she was “bringing dishonor to (his) family.”

Strict new laws passed by the Pakistani government in October ordered harsher sentences for honor killings while also making the rape of minors punishable by death. (CNN)