Police reveal sniper letter: "your children are not safe anywhere at any time." Link between sniper and bus driver shooting sought. news_sniper_bus_1022_abc.jpg l Kids "Not Safe" audio.gif rtsp://demand2.stream.aol.com/cnn/audio/topstories.rm?rpurl=http://www.cnn.com/ 10353003484530 CNN Audio Report lock_icon.gif superpass.gif http://abcnews.go.com/sections/us/videofiles/Video/021022sniper_video.ram 10353003484531 ABCNEWS Video (Members) lock_icon.gif lock_icon.gif big_headline