No one immediately claimed responsibility for Sunday's bombing, which also injured nearly 200 people. Police said their initial investigation suggests the Islamic State group's regional affiliate could be behind the attack, in the northwest province of Khyber Pakhtunkhwa.
The victims were all from the Jamiat Ulema Islam party, which is headed by hardline cleric and politician Fazlur Rehman.
The IS regional affiliate - known as the Islamic State in Khorasan Province - is a rival of the Afghan Taliban.
At least 1000 of Rehman's supporters had gathered in Bajut on Sunday as part of their party's preparations for the next parliamentary elections when the explosion occurred.
"People were chanting 'God is great' on the arrival of senior leaders when I heard the deafening sound of the bomb," said Khan Mohammad, a local resident who said he was standing outside the tent where the rally was held.
Provincial police said the attack was carried out by a suicide bomber who detonated his explosives vest close to the stage where several senior leaders of the party were sitting.
Pakistani security analyst Mahmood Shah said breakaway factions of the Pakistani Taliban could be behind the attack.
Bajur resident Salim Khan, 45, said from a hospital bed that he lost consciousness after the bombing. "When I opened my eyes, I was here in the hospital, and I only remember that I heard a large explosion," he said.
Female relatives and children wailed and beat their chests at family homes on Monday as the dead were taken for funerals, following local customs. Hundreds of men followed the caskets to mosques and open areas for special funeral prayers and then into the hills for burial.
Pakistan Prime Minister Shehbaz Sharif called Rehman to express his condolences and assure the cleric those who orchestrated the attack would be punished.
The bombing has also drawn nationwide condemnation, with ruling and opposition parties offering condolences to the families of the victims. The US and Russian embassies in Islamabad also condemned the attack.
Abdul Rasheed, a senior leader in Rehman's party, said the bombing was aimed at weakening the party but that "such attacks cannot deter our resolve".
The Pakistani Taliban also distanced themselves from the attack. The outlawed Tehreek-e-Taliban Pakistan, or TTP, said the attack aimed to set Islamists against each other.
Zabihullah Mujahid, the spokesman for the Afghan Taliban, posted on the social media platform X that "such crimes cannot be justified in any way".
Sunday's bombing was one of the worst attacks in northwest Pakistan since 2014, when 147 people, mostly schoolchildren, were killed in a Taliban attack on an army-run school in Peshawar.
In January, 74 people were killed in a bombing at a mosque in Peshawar. And in February, more than 100 people, mostly policemen, died in a bombing at a mosque inside a high-security compound housing Peshawar police headquarters.
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