NEW DELHI: SNIPPET: "The US national, identified as Winston Marshal Carmichael, was detained late last night after CISF personnel found knife in his hand baggage during the security check when he was to leave for Doha in a Qatar Airways flight, official sources said. ( Watch Video ) Reminiscent of the case of terror suspect David Headley, arrested in Chicago in October last for allegedly plotting terror strikes in India, Carmichael is a convert from Christianity to Islam. The New York resident changed his religion some 40 years ago. Carmichael, who was flying to Doha in a Qatar Airways flight,...