The deadliest attack in Pakistan's troubled election campaign has killed at least 70 people, including a candidate, as disgraced former prime minister Nawaz Sharif returned home to face arrest.

Ahead of his return, police swept through Lahore, arresting scores of Sharif's Pakistan Muslim League party workers to prevent them from greeting him at the airport.

She also retweeted videos and images of PML-N supporters gathering in several parts of Pakistan.

Barbed wire was strung across some roads leading to the Lahore airport on Friday and barricades were positioned at the roadside ready to close off main boulevards should crowds start to gather.

More than 100 people were arrested in his stronghold of Lahore where he has called on crowds to meet him when he touches down from London on Friday evening.

'Why is Lahore under siege? Talking to reporters before reaching the airport, Shahbaz said "a sea of people" has turned up today to give historic reception to Sharif."The people of Lahore has given a verdict ahead of July 25 polls", he declared.

Former lawmaker Imran Khan, who hopes to become the next prime minister, condemned Friday's attack against his opponent, Durrani.

The country's media regulator warned local news channels to abstain from airing statements 'by political leadership containing defamatory and derogatory content targeting. judiciary and armed forces'.

The Sharif family is now facing two more corruption cases in the accountability court - Al-Azizia Steel Mills and Flagship Investments - in which they are accused of money laundering, tax evasion and hiding offshore assets.

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Sharif and his daughter were sentenced in absentia to 10 years and seven years in prison, respectively, for failing to explain how they acquired expensive properties in London.

Sharif alleges the military is aiding a "judicial witch-hunt" against him and the PML-N.

The army has strongly rejected charges it is meddling in the democratic process, or muzzling the media, to rig the polls in favor of the Pakistan Tehreek-e-Insaf (PTI) party, led by sports celebrity Imran Khan. The party's past five years in power has been punctuated by the civil-military discord that has plagued Pakistan since its inception. The military denied the accusations saying their assistance in carrying out the elections was requested by Pakistan's Election Commission. The army will deploy 350,000 security personnel to polling stations on election day.

The case came to light after the 2016 Panama Papers revealed that the apartments were bought through offshore companies. They both deny wrongdoing.

The elder Sharif had been dismissed as prime minister last July, after the Supreme Court ruled that he had lied on a parliamentary wealth declaration.

Nawaz Sharif has called for a "mass gathering of the people".

The kind of reception Sharif receives on the streets of Lahore will be viewed carefully in Pakistan, where political popularity is often measured by the size of rallies that politicians can attract.

"(The) public is demanding accountability of corrupt leaders of political parties", Khan said.