37 people died in Pakistan after explosion at Islamist political rally
More than 100 people were also injured in the explosion in north-west Bajaur district, where Jamiat Ulema-e-Islam-Fazl (JUI-F) was meeting.
Police told that they have found evidence suggesting the explosion was a possible suicide attack.
A rescue operation has been completed and all injured have been taken to hospital, officers said.
Officials have warned the death toll may rise further, as 15 people are in a critical condition.
The motivation behind the attack is not yet clear. Security forces have cordoned off the area and an investigation into the explosion is taking place.
Hundreds of people were attending the JUI-F workers' convention on Sunday in the town of Khar, in the Pakistani tribal district of Bajaur, Khyber Pakhtunkhwa province, near the border with Afghanistan.
Pictures showed hundreds of people gathered under a canopy when the blast happened close to the stage.
One eyewitness said the tent collapsed, trapping people who were desperately trying to escape.
Images broadcast on local TV show ambulances ferrying injured people to hospital, while police confirmed those with serious injuries have been flown by military helicopters to nearby Peshawar for urgent medical treatment.
Authorities have declared a health emergency at the district hospital.
Some badly injured people have been waiting in the hallways of health clinics struggling to cope with the high number of casualties.
A regional leader of the JUI-F, Maulana Ziaullah, was killed in the blast.
JUI-F is a major religious political party and forms part of the government coalition in Pakistan's parliament.
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