"We don't want an innocent to be presented as the culprit and killed just to wash this case", said one of the protesters.
CCTV footage purportedly showed Ansari, 8, being abducted last week outside her home in Kasur district.
Police said six girls have been sexually assaulted in recent months in Kasur, and many figures including actor Hamza Ali Abbasi questioned whether enough was being done to ensure authorities kept young women in the region safe.
On Wednesday, Zainab was laid to rest even as massive and violent protests and riots rocked Kasur. Traders shut their shop and staged a demonstration, according to Dawn. The protesters were dispersed by the police through aerial firing which resulted several injured and 2 dead.
"People need to keep their emotions in check and not aggravate the situation", he said, adding that "a child's safety is its parents' responsibility". He said that four days had passed, but yet none of the culprits was apprehended.
On January 4, the victim's family had registered a complaint with the local police stating the minor girl had gone missing after she went for her Quran class.
The incident has also sparked an uproar on social media.
A First Investigation Report (FIR) has also been lodged against the assailants on the directives of Chief Minister of Punjab Shehbaz Sharif, who strongly condemned the heinous act and also expressed solidarity with the bereaved family.
An eight-year-old girl was raped and killed in Kasur before being dumped in trash.
Pakistani demonstraters carry placards during a protest against the rape and murder of a child in Lahore on January 11, 2018. Made it absolutely clear to them that lip service would not work.
"I am heartbroken, gutted and disgusted ... what sort of society we r living in, heart goes out to the parents. Those failing in their duties will be proceeded against".
"The beasts who have disrespected our daughters should be punished immediately", former Pakistani prime minister Nawaz Sharif said. Pakistan Peoples Party chairperson Bilawal Bhutto Zardari criticised the provincial government.
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.
The distraught father of the 7-year- old girl has blamed the "callous attitude" of police as the government roped in military intelligence and the ISI to probe the horrific incident that shocked the country.
- Things Get Hot As Heat Beat Raptors, Blazers Quiet Thunder
- 'Bomb cyclone': schools close as snowstorms hit United States east coast
- Rozier steals the show in Celtics win
- Supreme court leans toward OH voter purge - and other states may follow
- Late Bellerin strike earns Arsenal draw with Chelsea
- UN welcomes talks b/w North, South Korea
- Oil hits highest level since 2015 amid Iran unrest jitters
- Fox Bumps Up Deadpool Sequel, Moves Back New Mutants to 2019
- Tonya Harding's Publicist Quits Over Alleged Demand to Fine Reporters $25000
- Prince Harry, Meghan Markle bundled up for visit to a radio station