WASHINGTON (AFP) - Al-Qaeda still has the capacity to stage international attacks from Pakistan despite US forces killing of the extremist networks leader Osama bin Laden, a US official said Friday. Appearing before Congress, State Department official Shari Villarosa renewed calls on Pakistan to take action against Islamic extremists, particularly in northwestern areas where militants enjoy a safe haven.Although the Al-Qaeda core is clearly weaker, it retains the capability to conduct regional and transnational attacks from Pakistan, Villarosa said in written testimony to the House Committee on Homeland Security. Villarosa, the deputy counterterrorism coordinator in charge of regional affairs, pointed to the Al-Qaeda linkages of Tehreek-e-Taliban and the Haqqani network. We will do our part and we look to the Government of Pakistan to take decisive steps in the days ahead, Villarosa said. Joint action against Al-Qaeda and its affiliates will make Pakistan, America and the world safer and more secure. She also called for action against Lashkar-e-Taiba, rooted not in the northwest but in populous Punjab province. US lawmakers have increasingly questioned the relationship with Pakistan, which has received some $18 billion since allying itself with Washington in the aftermath of the September 11, 2001 attacks. Representative Michael McCaul, a Republican from Texas, who chaired the hearing, voiced alarm that bin Laden lived comfortably in Abbottabad, home to Pakistans top military academy. Special Correspondent from Washington adds:?While acknowledging the 'complicated nature of US-Pakistan relationship, the White House said Pakistan remains vital for Washingtons success in the war against terrorism. I think we have made clear that our cooperative relationship with Pakistan is important. Its been complicated, obviously, but it is vital to our successful effort against terrorism and terrorists, White House Press Secretary Jay Carney told reporters at the regular news briefing. The cooperation weve received from Pakistan in the past has led to a variety of successes. We look forward to continuing that cooperative relationship, he said, when asked why the US should seek close ties to Islamabad. Further asked why the US should have intelligence cooperation with Pakistan, Carney said: There is no secret to the fact that this is a complicated relationship and at times a difficult relationship. But he emphasized: It is an important relationship which were committed to because the cooperation between our governments, our militaries, our security services, our intelligence services is so vital to the US national security interests.