A suspected Muslim extremist shot and killed three American missionaries and wounded a fourth at a hospital in Yemen. news_yemen_missionaries.jpg home Missionaries Killed superpass.gif http://abcnews.go.com/sections/world/videofiles/Video/021230yemen_video.ram 10404927102870 ABCNEWS lock_icon.gif superpass.gif http://start.real.com/rd?url=http://smilparse.real.com/showcase/1pubs/channels/cnn/cnn.smi&adcode=none 10404927102871 CNN lock_icon.gif lock_icon.gif big_headline