Some local media said ul-Haq was in the neighbouring city of Rawalpindi when he was shot and killed.
He said that his father was attacked at his residence by some unknown assailants, who stabbed him.
"He was resting in his room".
"His guard had left the room for 15 minutes, when he returned he found Maulana [Haq]'s body covered in blood in his bed".
Pakistani police and family of a top cleric Haq who was known as "father of the Taliban" has been killed in a knife attack in his bedroom at home in the garrison city of Rawalpindi.
"It was really sad to hear the news of the martyrdom of Maulana Samiul Haq", Nawaz said, praying the Almighty to have mercy on Pakistan. In a statement from Beijing, where he is now on visit to China, the Prime Minister directed to investigate the incident and bring the perpetrators to justice.
The report said gunmen riding on motorbikes opened fire on Sami ul Haq's vehicle and as a result he was injured and then died.
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Abdul Raziq and also targeted the commander of United States and North Atlantic Treaty Organisation troops in Afghanistan , Gen. Washington's top commander in Afghanistan General Scott Miller had earlier escaped unhurt in an attacked by the Taliban.
Punjab Chief Minister Sardar Usman Buzdar condemning the assassination of Maulana Sami ul Haq sought a report from the Inspector General of Punjab police.
Pakistan's Interior Ministry confirmed Haq's death in a statement on Friday evening and expressed its condolences.
His seminary is in the Akora Khattak in the Khyber-Pakhtunkhwa province, which borders Afghanistan. There he studied fiqh, usul al-fiqh, Arabic literature, logic, Arabic grammar (sarf and nahw), tafsir, and Hadith. He was member of the Senate from 1985 to 1991 and again from 1991 to 1997.
DW interviewed Haq in 2015, during a visit to Haqqania.
Afghan Taliban spokesman Zabiullah Mujahid said the "people of Afghanistan will never forget (Haq's) services for them" and his killers were the "enemies of Islam".
Haq's killing has come when religio-political parties in Pakistan are protesting on the streets against the Supreme Court's decision to acquit Asia Bibi.