The party's rivals, the Pakistan Muslim League-Nawaz (PML-N) and Pakistan People's Party (PPP), both raised concerns about the procedure through which results were issued, alleging their polling agents were not allowed to verify vote counts, as is mandated by law.
Imran Khan's PTI continues to maintain a lead on 112 seats of national assembly, as per the trends released so far.
The Opposition parties, mainly the PPP, PML-N and MQM have accused the Election Commission officials of rigging the polls in favour of Imran Khan's PTI.
In an effort to increase voter participation, the Election Commission has declared a public holiday on Wednesday.
Former worldwide cricket star and socialite Imran Khan is confident that a victory in Pakistan's general elections on Wednesday will kick start a revolution for a country bedeviled by corruption and insecurity.
Shahbaz Sharif (R), the younger brother of ousted Pakistani Prime Minister Nawaz Sharif and the head of Pakistan Muslim League-Nawaz (PML-N), shows a document as he speaks during a press conference at his political office in Lahore on July 25, 2018, as voting closed in general elections. Results will start trickling in within hours, and the likely victor should be known by early Thursday. The other loser in this regard is Bilawal Bhutto Zardari of the Pakistan People's Party, whose mother and grandfather are former prime ministers.
Located in the northwestern province of Balochistan near the Pakistan-Afghanistan border, Quetta has suffered from several Islamist and separatist insurgencies in recent years.
Asked about allegations that the Pakistan Army is meddling in the elections, the spokesperson said the United States will not comment on Pakistan's internal politics.
Mr Sharif, who won the last election, has been jailed for corruption after a scandal stemming from the Panama Papers leak.
"The Election Commission of Pakistan on Thursday said that results of the general elections were delayed due to a software error".
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Voting is segregated throughout Pakistan with every single polling station divided into sections for men and women, including separate election officials.
Muttahida Majlis-i-Amal (MMA) president Maulana Fazlur Rehman said he was going to call an All Parties Conference over the "rigged" election results.
A suicide bomber on a motorcycle rammed into people waiting outside a busy polling station in the Pakistani city of Quetta on Wednesday, killing at least 31 and casting a dark shadow on what was to be a historic day for the country as Pakistanis cast ballots to elect their thirds consecutive civilian government.
Jeff M. Smith - from the Heritage Foundation - said it was important to acknowledge that a peaceful transition of power via a democratic election is still a rare commodity in Pakistan and thus would be a positive step forward.
PML-N leaders while speaking to local media said the "inability to bring voters out" have hurt their prospects.
People of Pakistan went to the polls to cast their vote on Wednesday with social media quick to react to the events of the day. Sharif's party claims that their cadres were forced to stay at home which disenchanted their supporters to come out and cast their mandate.
Supporters of Pakistan Tehreek-e-Insaf (PTI) political party celebrate in Karachi. "We will take action", Yaqoob said.
As many as 12,570 candidates are contesting for a total of 849 seats of national and provincial assemblies in the general election.
The flagship BBC2 news programme opened with a piece documenting Khan's journey from a cricketing hero to a potential prime minister.
"(The bomber) was trying to enter the polling station.
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