Twitter user Jay Ewing witnessed a plane crash in Longmont, Col., and tweeted the news before media arrived at the scene.

https://twitter.com/#!/jaymewing/status/183252997101457409

https://twitter.com/#!/jaymewing/status/183259995427704832

Details still scarce, but there are now reports that two planes collided in the air:

https://twitter.com/#!/kaposkey/status/183260430028906496

First photo here.

Update: It was a mid-air collision.

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