WASHINGTON (CNN) -- British authorities denied a U.S. request to apprehend a man believed to have ties to the July 7 London bombings weeks before the deadly attacks, sources familiar with the investigation said Thursday.Haroon Rashid Aswat, 30, a British-born citizen of Indian heritage, is in custody in Zambia, U.S. and Zambian officials told CNN. U.S. authorities wanted to capture Aswat, who was then in South Africa, and question him about a 1999 plot to establish a "jihad training camp" in Bly, Oregon. According to the sources, U.S. officials had Aswat under surveillance in South Africa weeks before the July...