"In view of the reports regarding the death of Mullah Omar and the resulting uncertainty, and at the request of the Afghan Taliban leadership, the second round of the Afghan peace talks, which was scheduled to be held in Pakistan on July 31, 2015, is being postponed," Pakistan's Foreign Office said in a statement.
The second round of the landmark peace talks were set to be held in the hill resort of Murree where the first round was also held on July 7.
"It is further hoped that those forces, which due to their malafide intent wanted to undermine the peace talks, will not succeed in their designs," it said.
The Afghan Taliban today confirmed the death of Omar, a day after it was announced by the Afghan government.
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"The leadership of the Islamic Emirate and the family of Mullah Omar... Announce that leader Mullah Omar died due to a sickness," the Taliban said in a statement using the movement's official name.
Earlier this month, the Afghan Taliban had issued Omar's "message" on the eve of Eid in which he had hailed as "legitimate" the peace talks between his group and the Afghan government aimed at ending the 13-year war in Afghanistan.