The Obama Administration has asked Pakistan to take action against terrorist groups operating from its borders, such as Lashkar-e-Taiba (LeT).<br/><br/> This is the message that was conveyed to the top Pak officials when the Assistant Secretary of State for South and Central Asia, Robert Blake, was in Pakistan recently. <br/><br/> Mr. Blake told reporters at a news conference in Washington,that LeT has growing ambition and scope in its activities, as shown by the David Headley case.