"Despite passage of six months of DNA test, killer of Ayesha Asif is still on the loose as Punjab police have failed to nab the culprit", said father of the minor while talking to ARY News.
Preliminary examination of the minor's body - that was recovered from a garbage dump on Tuesday - had revealed rape before she was killed, and led to violent protests in Kasur during which two people died and several acts of vandalism took place.
On Thursday, protesters threw stones at government buildings and set cars and a local politician's office alight, complaining that police had not done more to stop violence against children.A local police spokesman told AFP news agency "up to 1,000" people had taken to the streets.
Soon after her abduction, her panicked family had received footage showing her walking with a stranger near Peerowala Road.
What's even more shocking is that at least 11 similar cases are reported to have taken place within a two kilometre radius in the city in the previous year.
Kasur made worldwide headlines in 2015 when a gang of paedophiles running a child sex ring was busted, Dawn reported. She was kidnapped from doorstep of her house in Kasur on January 7 and her body was found in a building in front of her school on January 9 past year.
It is four days after the barbaric incident of little child's murder however, the killer has so far been arrested. As reporters surrounded them outside Islamabad's Benazir Bhutto International Airport, her grieving mother said: "I have nothing to say, I just want justice for my daughter".
Police at the time dubbed the murder a serial killing, but said they were not ruling out rape.
Police earlier told Dawn that DNA samples from the victim's body have been dispatched for forensic testing.
"Initial autopsy report suggests that the girl was strangulated after rape", Hameed said. He said Punjab Chief Minister Shehbaz Sharif was personally monitoring the case.
As word got around, traders shuttered their shops and staged a protest demonstration. A hashtag #JusticeforZainab has also started trending on social media.
Laws for the protection of children must be made in line with worldwide laws, he said.