Zainab's body was discovered some 2km away from her home by passers-by on Tuesday, 9 January, five days after she was kidnapped on 4 January. This is the 13th case of rape and murder in past one year police believe that a serial killer may be on loose.
Two protesters were killed on Wednesday after an angry crowd tried to storm the local police headquarters, and police opened fire.The Punjab government is offering a 10m rupee ($90,000; £67,000) reward for anyone who helps police find and arrest Zainab's killer, and has offered 3m rupees each to the families of those killed by police on Wednesday, the BBC was told.
Note that when the little girl was abducted, her parents were out of town and returned hurriedly when her absence was noticed. Reports say that a video has emerged of her walking hand-in-hand with a stranger and police are verifying the footage.
Kasur witnessed protest after body of Zainab was found in a garbage heap on Jan 10.
Police authorities have been given the report of the DNA test in Zainab's case, the source said.
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Zainab's father, Ameen Ansari, told the BBC that he did not agree with the violence of protesters, but understood the anger at police."If the police had done their jobs properly then they would have found her as soon as they got hold of the CCTV", he said.
Police earlier told Dawn that DNA samples from the victim's body have been dispatched for forensic testing.
Regional Police Officer (RPO) Kasur Zulfikar Muhammad confirmed that the girl was strangled to death. He said Punjab Chief Minister Shehbaz Sharif was personally monitoring the case. They also threw traffic out of gear by burning tyres on Ferozepur Road and chanted slogans against police and local parliamentarians for their alleged apathy.
Rabbani said that when the Kasur child abuse scandal surfaced in 2015, he had raised concerns that the outrage would die down within a few days, which is why it is necessary that the government take long-term measures to ensure the safety of children.
The chief justice also summoned the complete details of similar cases related to children in Punjab. Existing laws that deal with crimes against women could possibly be expanded to include crimes against children, he suggested.