WASHINGTON, Sept 20 (AFP) - Iraq could unleash a biological attack on the West by using unsuspecting people traveling abroad as carriers of deadly germs, a prominent Iraqi defector warned late Thursday. Nuclear scientist Khidhir Hamza, who left Iraq in 1994 and now lives in the United States, told the US Congress he suspected the Iraqi security service, which runs the country's biological weapons program, had already used people traveling abroad to reunite with relatives to infect exiled dissidents with the deadly AIDS virus. "An angle rarely reported -- and I found extensive incidents regarding it when I left...