PAKISTANS Army has pledged to go after militants the US wants targeted in an area harbouring Al-Qaeda that has become 'the epicentre of terrorism, President Barack Obamas top military adviser said. Navy Admiral Mike Mullen, Chairman of the Joint Chiefs of Staff, said Pakistani Army Chief General Ashfaq Parvez Kayani has given assurances he will mount an offensive the US has long called for in North Waziristan along the Afghan border. Mullen cited as evidence for his optimism Pakistans offensives against the Taliban and related groups elsewhere in the country during the past one and half year. Hes committed to me to go into North Waziristan and to root out these terrorists as well, Mullen, 64, said in an interview with Bloomberg Television to be broadcast this weekend. He clearly knows what our priorities are. North Waziristan 'is the epicentre of terrorism, Mullen said. Its where Al-Qaeda lives. Theyve sacrificed, theyve lost a lot of citizens and they are really concerned, urgently concerned, about the threat to their own country from terrorists, Mullen said. Two years ago, that wasnt the case. Still, Mullen didnt give a timeframe for a possible offensive in North Waziristan. He said Kayani has primarily targeted groups that pose an internal threat, not those the US considers most dangerous. Mullen, who took office in October 2007, said he has probably been to Pakistan 20 times, seeking to rebuild ties that frayed in the 1990s. The US relationship with Pakistan comes from what I call a very dark hole where we left them, Mullen said. So to assert certainties right now I think is a real challenge. Pakistans military also is hampered by its governments failure to establish firm civilian control in areas where the army has routed the Taliban, Mullen said. He cited the forested Swat Valley, where the Pakistani Army swept out guerrillas in a 10-week military campaign beginning in May 2009. Hes got no government to build behind the offensives, Mullen said. So hes got his forces literally pinned down in Swat until the government can actually come in, provide the security, the police. While military action by the US and its allies in Afghanistan and Pakistan has degraded Al-Qaeda, Osama bin Laden 'is still running the group, Mullen said. Hes struggled doing that to some degree over the last couple of years, Mullen said. Still, the threat to the US is 'every bit as intense as it has been.