The developments came on a day when Prime Minister Nawaz Sharif signalled his determination to end terrorism through dialogue. He said his only wish was for the talks with the Taliban to move forward successfully.
The committees from the two sides will meet in Islamabad at 2 pm tomorrow, officials said.
The decision came following a telephone conversation between radical cleric Samiul Haq, a member of the panel nominated by the Tehrik-e-Taliban Pakistan (TTP), and Irfan Siddiqui, a senior journalist who is part of the government's committee.
However, the Tehrik-e-Insaf's top decision-making body today declined the Taliban's proposal to include Imran Khan in its committee. It appreciated the trust reposed by the TTP in Khan and said talks must begin soon.
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The party noted it already had a representative - former ambassador Rustam Shah Mohmand - in the government committee.
JUI-F chief Fazlur Rehman also announced his party would not be part of the peace process initiated by the government. He said Mufti Kifayatullah, named for the Taliban's committee, is bound to accept the party's decision.
The four-member committee appointed by the government comprises senior journalists Irfan Siddiqui and Rahimullah Yusufzai, former ISI official Major (retired) Muhammad Amir, former ambassador Rustam Shah Mohmand.