Pakistans caretaker Prime Minister Nasir-ul-Mulk described the killing of Pakistan Taliban chief Mullah Fazlullah in a US drone strike in Afghanistan as a "significant development in the fight against terrorism." Mulk made the comment in a telephone conversation Friday night with Afghan President Ashraf Ghani and thanked him for sharing information about Fazlullahs killing, said a Pakistan government statement. According to The Associated Press, the call was initiated by Ghani, who tweeted that Fazlullahs killing was "the result of tireless human intel by Afghan security agencies." A US official said Washington believes that it is likely the strike killed Fazlullah, but efforts are ongoing to confirm his death. The official spoke on condition of anonymity to discuss preliminary information. In his tweet, Ghani said he also called Pakistans Army Chief Gen. Qamar Javed Bajwa. In both conversations Ghani said he urged Pakistan "to take practical steps to bring Afghan Taliban residing in Pakistan to the negotiation table." Thursdays drone strike, which reportedly killed Fazlullah and five other insurgents when missiles slammed into the car in which they were driving, occurred just hours before Afghanistans Taliban began a three-day cease fire, the AP reported. Also Saturday, a senior Pakistani police official said gunmen riding on motorcycles have opened fire on a vehicle carrying paramilitary soldiers in the countrys southwestern city of Quetta, killing three troops before fleeing. Officer Naseeb Ullah said the attack took place in the citys Saryab Road neighborhood when residents were celebrating the three-day Eid al-Fitr holiday. No one claimed responsibility for the attack and Ullah said police transported the bodies to a nearby hospital. Also late Friday, militants killed three Pakistani soldiers in a cross-border attack in the North Waziristan region bordering Afghanistan.