Strange noise and bright flash in the sky in Minnesota – Military test?

This strange noise and the mysterious bright flash happened on September 25th, 2011 at a small lake West of Alexandria, MN.

The constant hum/rumble lasted for around 4 minutes. The sound changed slightly just before the mysterious flash and then faded away. But what was this unknown light? Military trainings? Ball lightning?

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The strange phenomenon occurred at around 2pm. The sky was very cloudy but no rain or thunder/lightning.

Another witness believes the sound was  a transformer blowing up but he didn’t see the flash.

The flash is at 1:16:

The uploader thinks it is something military related.

Any ideas? Ball lightning?

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