The cleric 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's provincial capital.
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She said it was likely Zanaib may have been dead for two or three days by the time her body was recovered on Tuesday.
Police believe she may have been held captive for between two and four days following her disappearance on January 4.
Doctors said the young girl's hyoid bone had been fractured, which strongly suggests she had been strangled.
Hundreds of protesters hurled projectiles at a hospital, attacked the home of at least one local politician, and complained of police inaction.
Gov and the concerned authorities must take action.'Ihtisham ul Haq, summed up many people's exasperation at a lack of progress in finding the killer.'The picture of Zainab's rapist & killer is clearly captured. In a speech to thousands of mourners, he blamed the Punjab chief minister, Shahbaz Sharif, for failing to 'protect lives and honour of innocent girls' in the province.