Seven years after the deadliest attack on the United States, Al-Qaeda's masterminds remain beyond US reach, stirring violence and plotting new attacks on the West, officials and analysts say. From sanctuaries in nuclear armed Pakistan, Osama bin Laden and his deputy Ayman al-Zawahiri are presiding over an Al-Qaeda that has sprung back from serious setbacks with help from its old friends, the Taliban, they say. They are "not only still at large, but actively communicating with their followers around the world by video messages, and actively engaged in supporting two wars against American forces -- in Afghanistan and Iraq," said Bruce Riedel, a former CIA officer. With political turmoil in Pakistan and a revived Taliban insurgency in Afghanistan, Al-Qaeda is in the thick of things once again despite shattering losses in Iraq and Saudi Arabia. "Today, if violent extremism and terrorism have a center, it is Pakistan and not Iraq," said Anthony Cordesman, an analyst at the Center for Strategic and International Studies. US intelligence worries that Al-Qaeda is using its Pakistani safe havens to prepare for attacks on the West. It now enjoys many of the operational and organizational advantages there that it had in Afghanistan before the September 11, 2001 attacks on the United States, said Ted Gistaro, the US government's top intelligence analyst for transnational threats.