UFO Video - Smoky trail UFO on video over East London Memorial Grounds June 2011

I Recorded This From "The Greenway" In Stratford East-London, Memorial Grounds, What You Can't See Is That There Is Actually TWO Objects, And What Was Not Recorded Was The Third, If You Know What This Is Please Comment. Even thought this ufo behavior is very similar to a comet, there is no comet that can go up and down while flying in the sky.