"The Pentagon says it's trying to figure out whether a missile was launched off the coast of southern California and who might have launched it.
Officials with the navy, air force, Defence Department and North American Aerospace Defence Command say they are looking into a video posted on the website of Southern California television station KFMB.
The video appears to show a rocket or some other object shooting up into the sky and leaving a large contrail over the Pacific Ocean.
Pentagon spokesman Colonel Dave Lapan said Tuesday that officials can't confirm that there was a launch and if there was, by whom. He says officials are talking to civilian and defence authorities who control and monitor air space."
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Mystery Solved? Missile Launch Could Be a Jet Contrail
"A video that appears to show a missile launch off the coast of California is so far "unexplained" by anyone in the military, a Pentagon spokesman told reporters Tuesday -- but what seems mysterious could be nothing more than an airplane.
Federal officials do not consider the event a threat. And they aren't the only ones.
According to a post on ContrailScience.com, the visible exhaust from a jet engine, a trail of condensed water vapor called a contrail, resembles a missile trail when seen from some angles. "