More than 120 others injured when bombs blast during election rallies in Pakistan's restive Balochistan and Khyber Pakhtunkhwa provinces.
The bombing was the biggest attack in Pakistan in over a year and is the third incident of election-related violence this week.
"Seventy bodies are in six different hospitals and there are more than 120 wounded. Between 15 and 20 injured people are in critical condition," Balochistan caretaker health minister Faiz Kakar said.
Pakistani Police had earlier said that more than 1,000 people were in attendance at the rally.
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 on Friday, near the Afghan border.
The earlier bomb, near the town of Bannu in Khyber Pakhtunkhwa province, was targeting the convoy of Muttahida Majlis-e-Amal (MMA) candidate and former minister, Akram Khan Durrani, who survived the attack, police said.
No group has yet claimed responsibility for the attacks.
With the July 25 polls in the country fast-approaching, there has been a spike in violence with three major attacks targeting election campaign events and candidates during the past week.
On Tuesday a bomb claimed by the Tehreek-i-Taliban Pakistan (TTP) militant gorup targeted a rally by the Awami National Party (ANP) in the city of Peshawar. Hospital officials said Friday that the toll in that attack had risen to 22.
