Zainab's father Ameen Ansari has said that he will "not bury Zainab until the killer is caught".
Seven-year-old Zainab, a resident of Road Kot area of Kasur, was found raped and murdered this week after she went missing on January 4. Businesses reopened, but police and paramilitary troops were still out in force and guarding government buildings.
"We don't have any expectations from police, as we gave proof to police including the CCTV footage, but they could do nothing", her uncle Hafiz Muhammad Adnan told Reuters.
Zainab's parents were away on a pilgrimage when the incident took place.
A police official speaking on condition on anonymity said two of Ansari's relatives had been interrogated and 26 locals are now in custody and being questioned.
Kasur made global headlines in 2015 when a gang of paedophiles running a child sex ring was busted, Dawn reported. A police constable deputed to trace the girl recovered her body from a trash heap on January 9.
The gang allegedly abducted and sexually assaulted at least 280 children in the area, blackmailed the families of the victims since 2009, and even sold video clips and images of the assault.
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A division bench of the Lahore High Court on Friday ordered the Punjab inspector general of police (IGP) to arrest without fail the killer of innocent girl Zainab within 36 hours. "I'm a mother and that is why I'm sitting here with my daughter", Naz was quoted as saying by The Times of India report.
The gruesome murder of Zainab Ansari that shook not just the whole country but a large number of people around the world as well is 12th incident of its own kind in Punjab in a year in which a child is abducted from near house, killed and then its mauled body is dumped in proximity of its house.
Police earlier told Dawn that DNA samples from the victim's body have been dispatched for forensic testing.
Punjab Chief Minister Shehbaz Sharif will address the media after the final suspect is arrested. Elsewhere in Pakistan, people took to social media to voice their anger over Zainab's death.
"All institutions must work together, and implementation of laws must be strengthened", he said. He said 227 suspects were arrested during this period and DNA of 67 of them was got examined.
Laws for the protection of children must be made in line with worldwide laws, he said.