Her body was found in a trash heap five days later.
Adnan said the kidnapper waited to dump the body after search parties took a break after four days of looking.
Protesters ransacked the office of the deputy commissioner Kasur where police opened fire injuring three persons.
The girl's father, who was away in Saudi Arabia to perform Umrah when the incident happened, slammed the police for its callous attitude, prompting the administration to rope in officials from the military and ISI to trace the killers.
The incident was widely reported by local media, and people across the country took to social media to condemn the crime. "We don't want an innocent to be presented as the culprit and killed just to wash this case", said one of the protesters. The locals in Kasur were assuming that Zainab might be sold or murdered after rape.
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Cops called her dad, Steve Roland, from a neighborhood Chick-Fil-A to state they'd discovered the missing 29-year-old writer. They discovered her cellphone and different assets inside, cops stated, while her satchel was found at a close-by business.
The brutal murder of the girl, the 12th such case to occur within a two-kilometer radius of the city over the previous year, ignited a wellspring of anger among the city's residents.
An air of gloom, mixed with rage, hovers over Kasur, a small town situated around an hour's drive from Lahore in Pakistan, following the brutal discovery of the rape and murder of seven-year-old Zainab.
An autopsy has confirmed that Zainab was strangled and sodomized and suggests she was raped, the medical officer who carried out the examination, Dr Quratulain Atique, told CNN. When Zainab was missing her, uncle Muhammad Adnan reported an FIR on Jan 4 in Sadar Police Station of Kasur. Pakistani Nobel Prize victor Malala Yousafzai recently joined the family's call for justice. The parents returned on Wednesday 10 January.
The Senate Standing Committee on Interior also took notice of the incident and ordered the Punjab police to take swift action.
Chief Minister Punjab Shehbaz Sharif said that he will supervise the Zainab case himself till the case is not resolved and won't let the rapist escape. We have to act swiftly to punish the guilty & ensure that our children are better protected'.
Mr Qadri is a staunch political rival of the ruling Pakistan Muslim League party and he has led violent rallies in the capital, Islamabad, since 2014 after eight of his supporters were killed in anti-government rallies in Lahore, Punjab provincial capital. At least two people have been convicted in the case, in which authorities say hundreds of children in the district were abused.