U.S. Central Command for Iraq and Afghanistan General David Patraeus and Assistant Secretary of State Richard Boucher has called on Federal Defence Minister Ahmed Mukhtar here on Monday. Two sides exchanged views on bilateral relations, Pak-US Defence ties and present regional situation. US drones' attacks also came under discussion. Gen . Petraeus, who took over as head of U.S. Central Command on Friday and U.S. Assistant Secretary of State Richard Boucher landed in Pakistan on Sunday. Gen . Patraeus is on his first foreign visit after assuming the new task. He will hold separate meetings with key government representatives and top officials of armed forces. His first visit to Pakistan as a Central Command shows increasing U.S concerns about Al-Qaeda, ongoing war in Afghanistan and Pakistan's present situation.