UFO Sighting in boilingbrook, Illinois on July 4th 2015 – first observed two black boomerang objects moving southwest at high speed, one returned above treeline going west.

driving down naperville/washington rd. i believe. area is unfamiliar to me. two dark boomerang objects parallel to one another in close quarters moving at same speed very quickly. i believe speed increased as the objects moved farther away, which i believe was a south west direction. i pointed the objects out to my passenger , watching the confusion and facial reaction change to what they were witnessing i returned to watching the objects move at an accelerated speed until they were invisible. I was telling my passenger i wish i could get a closer look because i really want to know what it was. then a short moment later my passenger excitidly pointed to our left to see only one of the objects in the southern sky moving west asking me do i see it and what was it. i tried to view it but was unsuccessful. my passenger said they saw it just above the tree line and it was still a distance away. at the last moment the treeline fully obstructed the view. it was also the end of the tree line so excitidly we continued to look on to find the object must have dissapeared. there was a good clearing at the end of the tree line. if it did not dissappear it must have instantly changed directions. they appeared to be about the size of a full sized jet, maybe a little smaller. we could not identify these objects, they made no noise had no emission and moved quicker than any commercial jet. if it were a military jet i believe it would have broke the sound barrier. driving in an unfamilliar area and being the driver i was not able to get a view of the second boomerang object.