The little girl's murder first enraged the locals in Kasur as they attacked a police station to seek swift justice.
Zainab's uncle Hafiz Muhammad Adnan called for calm amid the protests and said police should catch the murderer alive. Police in Kasur said such incidents are happening regularly, hitting the city about once every other month.
Adding that "the smallest coffins are the heaviest and the entire society is burdened by the weight of [Zainab's] coffin", Naz helped to communicate what an entire nation is feeling.
"They have thrown stones on the buildings of the government hospital, police and deputy commissioner's office..."
Citizens were furious because this was the 12th incident of a girl being adducted, raped, and killed within the past year in Kasur district, police say.
He tweeted: "COAS condemns cold blooded murder of innocent Zainab".
According to local media reports, the girl was kidnapped while her parents where in Mecca performing a religious pilgrimage, and her body discovered by passers-by, in the town of Road Kot, in Pubjab province.
Zainab went missing on January 4 in Kasur, Punjab.
According to Pakistan's law, whoever commits rape of minor or person with mental or physical disability shall be punished with death or imprisonment of life. However, when the police found it hard to handle the mob, they opened fire, killing two and injuring three others.
Slamming the rigmarole of police investigation and political wrangling over such cases, Naz asserted that what should take precedence is ensuring justice for Zainab and punishment to the perpetrators. Police also confirmed that she was strangled to death after being raped.
He said that Punjab Chief Minister Shahbaz Sharif has told the forensic lab to expedite the process for Zainab's autopsy.
"We have questioned more than 5,000 people and collected DNA samples from around 65 suspects in a bid to apprehend the predators", Ahmed said, referring to eight rape-murder cases involving minors.
Pakistan's Chief Justice Saqib Nisar also took suo motu notice of the case later on Wednesday, ordering the Punjab Inspector General of Police to submit a report to the court within 24 hours.
"Aseefa Bhutto Zardari, the youngest daughter of late former prime minister Benazir Bhutto and former president Asif Ali Zardari, said: "#JusticeForZainab she was only 7 years old!