Farishta Mohmand’s body was found in woodlands near her home in the capital Islamabad, five days after her father first raised the alarm.
His daughter’s body showed signs of rape and torture, Gul Nabi told CNN.
“The body was in bad condition, it felt as if someone had thrown acid on her,” he said.
Farishta’s death has become a lightning rod in a country where there is widespread violence against children and women. Many have seized on the delay in police action as proof of institutionalized gender discrimination.
Earlier this week, the hashtags #FarishtaMohmand and #JusticeForFarishta became top trending terms on Pakistani Twitter, with many users calling for the resignation of the police responsible for handling the case.
With anger continuing to build, Interior Minister Ejaz Shah on Tuesday ordered an inquiry into the case.
Islamabad’s inspector-general of police suspended the station house officer in Shahzad Town, a district of Islamabad where Farishta’s father reported her missing.
By Tuesday evening, police said they had arrested three suspects, including a 14-year-old relative who is the main suspect.
‘Increasingly brutal society’
The Human Rights Commission of Pakistan said the latest case bore a “chilling resemblance” to the 2018 killing of seven-year-old Zainab Ansari, whose body was found dumped on a garbage pile in the eastern province of Punjab.
A man called Imran Ali was arrested over her death, and hanged last October after being found guilty of murder, rape, abduction and sodomy of a minor.
Rights commission chairperson Mehdi Hasan said Farishta’s death suggested Pakistan was becoming “an increasingly brutal society in which children are abused and discarded at whim.”
“It is critical that stronger, more vigilant mechanisms be enforced to protect young children — and young girls in particular — who are among the most vulnerable members of our society,” Hasan said. “No society can afford to be this callous where its children are concerned.”
Rise in child abuse reports
Reports of child abuse in Pakistan are on the rise.
Some 55% of the victims were girls. The most common reported crimes against children were abduction, sodomy and rape.
Mumtaz Gohar, lead coordinator for a group called Child Right’s Movement Pakistan, said Farishta’s death was one of the rare cases that trended on social media. Most never got public attention.
“I’m afraid that in this case after a day or two our attention will be diverted,” Gohar said.
CNN’s Sophia Saifi reported from Islamabad, Pakistan, Julia Hollingsworth reported from Hong Kong. Journalist Adeel Raja contributed reporting from Islamabad.