U.S. Vice President Joe Biden will start this week an official visit to Pakistan to discuss with Pakistani officials, a number of files in spheres of security, military and economic ties. "Online News" agency of Pakistan quoted diplomatic sources as saying in Islamabad that Biden will hold a series of meetings with Pakistani officials led by President Asif Ali Zardari and Prime Minister Syed Yousuf Raza Gilani, Foreign Minister Shah Mahmood Qureshi and Pakistan's military leadership. "The talks will focus on the war against terrorism and the on-going security situation in the tribal region bordering Afghanistan and economic support provided by the United States to Pakistan," the agency said.