"Operation Zarb-e-azab will continue until terrorism is completely wiped out from the country. We have had talks with Afghanistan about jointly fighting the menace of terrorism," Sharif who rushed to Peshawar, the capital of Khyber Pakhtunkhwa, said.
Sharif said such incidents will not deter the determination of the goverment's efforts to defeat terrorism.
"There should be no confusion regarding our "resolve" to defeat the terrorism. Incidents like these will not weaken our resolve. It's a sheer act of cowardice. The country should unite to combat terrorism. There should be no "differences" among the people. The people should prove their unity and there should be no doubt about that," he said.
"Our fight (against terrorism) has entered a decisive phase and the Zarb-e-azab has been a great success so far. We have gained a lot of ground and whatever little is there for us to achieve, it will also be achieved with great success. People should pray and support these operations," Sharif said.
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At least 160 people, mostly students, were killed today in one of the most gruesome attacks in recent years against children anywhere in the world in Pakistan's volatile Peshawar city when heavily-armed Arabic speaking Taliban suicide attackers entered Army Public School on Warsak Road and shot indiscriminately before blowing themselves up.
"These terrorists are enemies of Pakistan, enemies of Islam and enemies of humanity. The Pakistani nation stands united in condemning this heinous crime and remains resolute in its commitment to eliminate terrorism from the soil of Pakistan," a Foreign Office statement said.