U.S. Assistant Secretary of State for South Asia Cristina Rocca arrived in Islamabad Saturday for four days of talks with Pakistani leaders in what U.S. embassy officials said was a regular review of world and regional developments. Rocca was to call on President Pervez Musharraf, Prime Minister Shaukat Aziz, Foreign Minister Khurshid Mahmud Kasuri and Foreign Secretary Riaz Khokhar. Rocca will also visit Afghanistan.