According to the sources, 47 people got injured in the blast and now are under treatment at Lady Ready Hospital in Peshawar.
Quoting Peshawar police chief Qazi Jamil, AP reported that 35 people were wounded in the attack, including Bilour's 16-year-old son.
Reacting to the incident, Caretaker Prime Minister Justice (r) Nasirul Mulk, Senate Standing Committee on Interior Chairman Rehman Malik, Chief Election Commissioner Justice Sardar Muhammad Raza Khan, Pakistan People's Party (PPP) Chairman Bilawal Bhutto Zardari, Pakistan Muslim League-Nawaz (PML-N) President Shehbaz Sharif and supreme leader Nawaz Sharif, as well as Pakistan Tehreek-e-Insaf (PTI) Chairman Imran Khan, condemned the attack and death of the ANP leader.
Haroon, who was ANP's candidate for the PK-78 constituency of Peshawar, was the son of Bashir Ahmed Bilour, a senior ANP figure who was martyred in a suicide blast in Peshawar in 2012. Mr Bilour was taken to hospital but later succumbed to his injuries. After being informed, rescue teams, police and ambulances rushed to the crime spot and investigation is underway.
The Bomb Disposal Squad (BDS) confirmed that it was a suicide blast.
A suicide bomber detonated his explosives soon after Haroon Bilour arrived in Yaka Toot area to address a corner meeting of his party. Officer Iqbal Khan says the bomber struck a Tuesday night rally for Haroon Ahmed Bilour, an Awami National Party candidate for a provincial seat. This is the second attack before Pakistan's assembly elections.
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The bombing came hours after the Pakistan military spokesman said there were security threats ahead of national elections scheduled for July 25.
The ANP, which governed the Khyber Pakhtunkhwa province from 2008 to 2013, has been a continual target of militant groups operating in the northwest.
Although there has been no immediate claim of responsibility for the attack, the city of Peshawar has for decades been a victim of militancy due to its status as a frontline for the ongoing war against terrorism as well as its proximity to the restless tribal areas and the Pak-Afghan border.
Officials said at least 54 people were wounded.