ISLAMABAD - The Haqqani Network remained high on the agenda of the US Central Command Chief General James Mattis meeting with Pakistani Army Chief General Ashfaq Pervez Kayani on Saturday as both the sides locked horns over taking on terrorist outfits in North Waziristan. The meeting that, according to reports proved inconclusive, was apparently held on the pretext of discussing trilateral dialogue process between Pakistan, US and Afghanistan but widely seen in sequel to the US mounting pressure on Pakistan for launching an all-out crackdown on the North Waziristan-based network. Both the generals, after reported exchange of intense arguments, agreed to continue 'dialogue process for future although they recognised that the Pak-US relationship was on a tense side. According to the sources, Pakistans military chief General Kayani was categorical in conveying to General Mattis that the 'provocative statements from the US Chiefs of Staff Admiral Mike Mullen and Secretary of Defence Leon Panetta were detrimental to improving the Pak-US relationship. Admiral Mullen on Thursday had blamed Pakistans Inter-Services Intelligence (ISI) for aiding Haqqani Network in launching attacks on US Embassy and NATO headquarters in Kabul. He had called Haqqanis as veritable arm of ISI while Panetta had hinted at US strikes in NWA if Haqqanis were not taken on by Pakistan military. The White House on Friday called on Pakistan to sever ties with Haqqanis. Reportedly, during Saturday meeting, Kayani referred to his recent meeting with Admiral Mike Mullen in Spain that saw a reported informal agreement between both the military men so as not to give 'tough public statements on Pak-US strategic relationship. This is not something we decided in Spain. It was not to be taken up in public, the irritated Kayani purportedly said. General James Mattis is reported to have strongly demanded of his Pakistani counterpart to launch a military crackdown on Haqqani Network in NWA. He communicated to Kayani that the US government, Congress and Pentagon were on the same page for acting against Pakistans direct support to the NWA-based outfit that, according to Mattis, was responsible for several attacks on US and NATO forces in Afghanistan. He is also quoted to have said that domestic pressure was building up on the US government to get Pakistan go hard on Haqqanis. General Mattis was reportedly adamant in his stance to categorically get it conveyed to his Pakistani counterpart that improvement in Pak-US ties was not possible unless Haqqanis were taken on. Military sources say that General Mattis did not give any assurance that the US would avoid 'provocative statements in future unless Haqqanis were taken to task. It was also conveyed to General Kayani that the US wanted nothing short of NWA operation and the US economic aid to Pakistan was conditional to launching crackdown against Al-Qaeda and its allied offshoots including, Haqqani Network, Lashkar-e-Taiba, Quetta Shura and other terrorist organisations. Haqqani Networks chief Sirajuddin Haqqani has warned the US against any military offensive in NWA. The US would suffer more losses in NWA than they did in Afghanistan, Haqqani told Reuters. The US Senate Appropriations Committee on Wednesday approved $1 billion for Pakistan Counterinsurgency Capability Fund but linked this aid to Pakistans action against the aforesaid terrorist organisations. During the meeting with Mattis, Kayani mentioned some neighbouring countries that, according to Kayani, were in direct contact with Haqqani, But we are singled out, Kayani said. On this, General Mattis reportedly responded, But nobody funds Haqqanis other than ISI. It is also learnt that General Kayani slammed Afghan militants terrorist activities in Pakistan and the US and NATO inaction over it. He mentioned troops deployment in Upper Dir and Chitral in this regard and asked General Mattis to make sure that NATO took practical steps against Afghan militants. Reportedly, General Kayani did not signal any indication regarding Pakistans intention to launch NWA operation other than saying, well see what we can do, and the seemingly inconclusive meeting ended on a see you again note. Pressure is believed to have been mounted manifolds on Pakistans military after it failed to adopt a vivid stance on Haqqanis in its Friday statement. Instead of defining a clear policy line, the seemingly vague statement passed the buck on which all countries are in contact with the Haqqanis. Prime Minister Yousuf Raza Gilanis 'warning to US to avoid 'inflammatory statements followed by Foreign Minister Hina Rabbani Khars 'intimidation that US was risking to lose an important ally have ceased to work on the US. The reports did rounds that General Mattis held separate meetings with Director General ISI Lieutenant General Ahmed Shuja Pasha and DG Military Intelligence Major General Naushad Ahmed Kayani but these reports could not be verified from an authentic source.