The deadliest attack in Pakistan's troubled election campaign killed 85 people at a rally in south-west Baluchistan on Friday ahead of the return to the country of former prime minister Nawaz Sharif.
Witnesses said that Siraj Raisani of the regional Balochistan Awami Party (BAP) was preparing to address hundreds of supporters in the Mastung district when the bomber near the stage detonated explosives strapped to his body.
The Islamic State group claimed responsibility for the attack.
Pakistan's caretaker government launched a crackdown on political gatherings on Friday as Sharif, who was ousted by the Supreme Court previous year and convicted in absentia of corruption a week ago, flew back to rally his party ahead of the general elections.
At least 30 people were wounded in the blast, which occurred just after the rally hosted by the JUI-F religious political party ended on Friday morning, said a police official, speaking on condition of anonymity.
Brother of Siraj Raisani, Lashkar Raisani have also confirmed the explosion killed Raisani, who was running for a provincial seat PB-35 with Balochistan Awami Party (BAP).
Siraj is the brother of former Chief Minister of Balochistan, Nawab Aslam Raisani.
The explosion comes hours after four people were killed and 39 injured when a bomb hidden inside a motorcycle detonated near a Pakistani politician's convoy in the country's northwest near the Afghan border.
The officials have said the death toll has climbed at least four people while at least 32 others have sustained injuries and are undergoing treatment in the District Headquarter Hospital in Bannu. No group has yet claimed responsibility for that attack.
Caretaker Chief Minister Dost Mohammad Khan condemned the incident and summoned an emergency meeting to discuss the security situation in the aftermath of the attack.
Local ANP leader Haroon Bilour was among the 22 killed.
Following the attacks, activists called for Pakistani authorities to remain vigilant to protect candidates during the final days of the campaign season.
Security situation in Pakistan has dramatically improved in recent years, with the military cracking down on militancy that has cost tens of thousands of lives in the past decade.
The election will pit the PML-N against its main rival, the Pakistan Tehreek-e-Insaf, a party led by cricket star-turned-politician Imran Khan. But analysts have long warned that the country has not tackled the root causes of extremism.
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