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On April 17, 2013 at around 2053 hours I was scanning the skies with a thermo imaging camera I notice a object that appeared to be a boomerang coming from the west to east. I notices the boomerang slit off in 4 circles object and became a tight formation. I grabbed my cell phone and started to record the screen while tracking the objects. I could not see these objects with the naked eye. They were not there. The thermo camera was the only thing picking them up.