US special representative to Afghanistan and Pakistan Richard Holbrooke has said that Pakistan's city Quetta appears to be Taliban's headquarter. In an interview to BBC on Monday, Holbrooke made it clear that "the number one problem" in stabilising Afghanistan were the Taliban sanctuaries in western Pakistan, including the tribal areas along the Afghan border and cities like Quetta. "Quetta appears to be the headquarters for the leaders of the Taliban and some of the worst people in the world," which he said includes the leader of the Pakistani Taliban Baitullah Mehsud. "As we speak, they are planning further attacks on the West and the region itself", he added. "It's tough," conceded Washington's envoy. "You cannot send troops into Pakistan. That is a red line". He refused to confirm or deny the reports that the US was now considering an expansion of its covert war into areas around Quetta. Asked about persistent reports that elements in the Pakistani military may be playing a double game by supporting elements of the Taliban, Holbrooke said, "We have heard these charges. We have talked to Pakistani leaders about them. Obviously, to the extent there is truth to them, we would be very, very concerned". Washington's much anticipated strategic review of Afghan and Pakistan policy is now on the President Barack Obama's desk and is expected to be made public in coming few days. It will send the clearest signal yet of how the new administration will tackle what it views as its biggest security threat. "I can guarantee you that this administration will do everything it can to succeed in one of the most difficult situations in the world," Holbrooke emphasised. AFP adds: US envoy Richard Holbrooke urged the EU Monday to boost aid to Pakistan to help beat the Afghan insurgency, as President Barack Obama seeks a way to end more than seven years of fighting. Holbrooke was in Brussels to brief NATO and European Union officials on a new US strategy for Afghanistan. It puts Pakistan at the heart of efforts to beat the Taliban, who are backed by Al-Qaeda fighters, drug runners and criminal gangs. "He asked the commission to increase its economic aid to Pakistan," an EU diplomat said, after Holbrooke held a series of "highly classified discussions" with officials, including members of the EU's executive commission. "We are all very concerned about what is happening in Pakistan. It is a major security issue for everybody, a problem of political stability," the diplomat said, on condition of anonymity. "It's a zone that's even more sensitive than Afghanistan." The commission has already made plans to send a team to Afghanistan next month to assess whether security is ripe for an observer mission to monitor potentially-pivotal elections in August. The polls are seen as a litmus test of international efforts to stabilise Afghanistan and foster democracy and reconstruction, seven years after the former Taliban regime was ousted by a US-led coalition. "The commission indicated that it was planning to commit 50 to 60 million (euros) for the Afghan elections," the diplomat said. The diplomat said that Holbrooke had also discussed Afghan government plans to boost the notoriously corrupt police, from around 78,000 personnel currently to around 180,000 officers. "We are going to try to coordinate and integrate the efforts of EUPOL, the US initiatives, and the action of the European Gendarmerie Force," the diplomat said, referring to the paramilitary police unit. In all, Washington believes between 2,000- and 3,000 instructors will be needed to rebuild a force that Holbrooke has described as the "weak link" in Afghanistan's security chain. Earlier Monday, the US envoy met NATO chief Jaap de Hoop Scheffer and ambassadors from troop-contributing nations in Afghanistan. "The ambassadors offered their viewpoints and of course had questions about where the US intended to go," a NATO official said, adding that the US review did not appear completed yet. The talks were the last before a "big tent" international meeting on Afghanistan in The Netherlands on March 31, when Washington's strategy for tackling a problem fuelling attacks around the world should be made public. The NATO official said ambassadors were reassured that "the US intention is not suddenly to go it alone but to marshall the international community, with NATO very much at the centre of this in some new direction." "There's got to be an exit strategy," he said in an interview aired Sunday on CBS television's 60 Minutes show. "There's got to be a sense that this is not a perpetual drift."