The original informant who prompted the terror alert on New York City's subways last week is sticking to his story, and there is no basis to conclude the threat was a hoax, sources involved in the investigation of the plot told ABC News. When last spoken to by interrogators, the original informant has remained firm in his statement that there was in fact a plot. Citing government sources, several media outlets reported today that information that led to heightened security for the New York City transit system was a hoax. Those reports said three men arrested in Iraq with suspected...