Sharing details regarding "14 days of relentless efforts" which led to the arrest of the suspect, Shahbaz said 1150 DNA profiles were taken to match the DNA obtained from the crime scene to trace out the culprit.
There has been no immediate comment either from the accused or his lawyers.
Zainab's rape and murder had prompted widespread protests not just in Kasur but across the country, with mobs going violent against the police and lawmakers in some areas.
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The accused faces charges of murdering eight girls in Kasur.
The prime suspect in the Zainab rape and murder case was brought to the court under tight security. He was apprehended after DNA samples picked from the girl's body matched his.
Imran kidnapped the seven-year-old minor girl on January 4 in Kasur when she was on her way to her aunt's house for Quranic recitation.
The abuse was uncovered in 2015 and multiple suspects were arrested.
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He said Zainab's father, public and even he himself demanded public hanging of the culprit and pleads that the court grant him an exemplary punishment.
In the video, Imran, whose involvement in the case was confirmed by CM Shehbaz on Tuesday, said that he tricked Zainab by telling her that he would take her to meet her parents - who had gone to Saudi Arabia to perform Umra.
A man, named only as Imran, has been arrested after his DNA matched samples found on her body, according to police sources. A CCTV footage had earlier revealed the victim walking with a stranger near Peerowala Road.
"He was arrested before, but was released as we did not have evidence". I beg everyone that such fragile, sensitive, heart breaking stories shouldn't be politicized."When asked about the accusations that police failed to act on previous attacks on girls in Kasur, Sharif said: "I agree that there should be accountability for the previous seven girls who were attacked by this serial killer and rapist".
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