Police have opened criminal cases against nearly 17,000 workers of the PML-N over breaking election rules, a statement said on Monday, as the country prepares to go to the polls next week.
The latest 16,868 cases, which the police statement said were registered in Punjab over the past four days.
The statement gave no details of which election rules were suspected of having been broken.
The party’s founder, ousted former prime minister Nawaz Sharif, facing a conviction in absentia on corruption charges, was jailed last week when he returned to the country seeking to revitalize the PML-N ahead of the July 25 vote.
The campaign has been riven by that accusations Pakistan’s powerful establishment is working behind the scenes to skew the contest in favor of ex-cricket hero Imran Khan.
National polls indicate a close race between the PML-N and the PTI led by Khan, with the Pakistan Peoples Party in third place.
Cases were also registered against 39 members from Khan’s movement, the police statement said.
It said 270 people had been detained, but it did not say which political party they belonged to.
The independent Human Rights Commission of Pakistan said it was concerned about the legitimacy of the election, saying “the public perception that all parties have not been given equal freedom to run their election campaigns”.
Police detained the members of the PML-N in Lahore last week ahead of a rally by tens of thousands of supporters welcoming home Sharif, who was arrested upon landing.
Three local government leaders of the PML-N said the crackdown involved intimidation and threats by the police, intelligence agencies and a paramilitary force to keep them from attending the rally welcoming Sharif.
They spoke to Reuters on condition of anonymity fearing a backlash from authorities.
On Sunday, Pakistani authorities opened a criminal investigation into leaders of PML-N under an anti-terrorism law.
The case relates to a march staged by the PML-N on July 13, when Sharif returned to Pakistan, which defied a ban on holding public rallies.