Police say the shooting of a 13-year-old boy outside a Maryland school Monday is related to last week's sniper killings. news_crime_marylandshooting1007_abc.jpg l Sniper Hits Again audio.gif rtsp://demand2.stream.aol.com/cnn/audio/topstories.rm?rpurl=http://www.cnn.com/ 10340076113950 CNN Audio (Free) lock_icon.gif video.gif http://abcnews.go.com/sections/us/videofiles/Video/021007bowie_video.ram 10340076113951 ABCNEWS Video (Members) lock_icon.gif lock_icon.gif big_headline