Which senior Pakistani official said the "complete elimination of terrorists operating with foreign backing" was essential after the Kohat attack?

Explanation: President Asif Ali Zardari, in his condemnation of the Kohat attack, stressed that the complete elimination of terrorists operating with foreign backing was essential for Pakistan's national security, while also expressing regret over the casualties and wishing the injured a speedy recovery. Prime Minister Shehbaz Sharif separately sought a report on the causes of the blast. For CSS Pakistan Affairs, such statements are useful as they reflect the state's consistent framing of domestic militancy as externally facilitated.