Vancouver UFO Skywatch maintains a live UFO skywatch on UStream, which captured this object crossing the sky, then suddenly vanishing. It could be a high altitiude meteor skimming the atmosphere, or even a high-flying aircraft of some sort, but it is most likely an unknown.
Story Source:
http://www.examiner.com/ufo-in-vancouver/ufo-vanishes-on-live-vancouver-ustream-skycam Dreamland Video podcast
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