United States is safer today because of the cooperation it has received from Pakistan, a top White House official said, maintaining that Washington's relationship with Islamabad is important but complicated. "The US-Pakistan are in an important relationship and it is complicated as I have said numerous times from the podium, but America and Americans are safer because of the cooperation we have been able to achieve with Pakistan," White House press secretary Jay Carney told a group of foreign correspondents. "It is important to remember that Pakistanis and Pakistan have been victims of the Al Qaeda, victims of all kinds of extremist terrorism, and we continue to pursue a relationship of cooperation and persistent as we continue to go after the Al Qaeda," Carney said in response to a question. Speaking ahead of the 10th anniversary of 9/11, the White House spokesman said the administration has been very frank about the fact that affiliates of the Al Qaeda are an issue. Al Qaeda central is not the only threat, certainly some of the very active branches of Al Qaeda are outside Afghanistan and Pakistan, so it is a multi-headed enemy, Carney said, adding the lone wolf issue is always of concern and that is something the US government is dealing with.