Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Taliban Says It is Unaware of Missing US Contractor Ayaz Gul ISLAMABAD - The Taliban said Friday it has conveyed to the United States the insurgent group is not holding an American hostage missing in Afghanistan. U.S. envoy for Afghan peace and reconciliation, Zalmay Khalilzad, has confirmed he called for the release of Mark Frerichs, a Navy veteran-turned contractor, in his meeting Wednesday with Qatar-based Taliban leaders. Meanwhile, Afghan officials said an insurgent-planted roadside bomb explosion in eastern Khost province killed the provincial police chief and his three security guards. The Taliban claimed responsibility for plotting the deadly attack. U.S. officials and family members say Frerichs was abducted in late January. No group in Afghanistan has since claimed responsibility in a country ravaged and mired by years of violence. "Yes, Dr. Khalilzad asked for his release and he has made similar requests in our previous meetings with him," Taliban spokesman Suhail Shaheen told VOA Friday. "But from our side, it has again been conveyed to him that Mark Frerichs is not with us, nor did we capture him," said the insurgent official from the group's political office in the Qatari capital of Doha. .