Explosion in sky?

Can anyone tell me what I saw in the sky? At 6:15/6:20 I was driving and saw something in the sky break apart. It appeared to be to the north, moving east, relatively low in the sky. At first it just looked like a fat vapor trail, but it broke up into lots of glowing pieces. It left a smoky streak in the sky that dissipated after about 10 minutes. Was there a rocket launch gone bad? A meteor? A plane breaking up?

Does anyone know? How can I find out?