The following exert is an eye witness statement. Please read into it what you will. This has been reported to mufon who I am sure are investigating:
it was a very hot day in buenos aires, me and my wife went out to the roof to lay down, she was with her phone i was just watching orions belt and sirius, all of a sudden i saw what i thought first a group of bright stars moving together, that was my first thought than i realised that it was not. i was laying down i told my wife to look, we both jumped and run to the other side of the roof to follow it,it was coming from east and heading west very silent, very low and very low speed, i worked in airlines before and i am an aviation enthusiast, there is no way that this object was an airplane or any other thing that i know. it was transparent and had lights down i am not sure if it had like 5 or 7 lights, when i first saw it the lights were very visible and strong than it reduced the light to 1/4 i would say, than i lost vision of it behind a tall building.
i kept telling my wife did you see that ?
another thing i did immediately after it disappeared is checking flight radar website to see if there were any plane flying around that area at that time i could not find any, which means that thing was not captured by the radar,
flight radar is very accurate i use it all the time.
if anybody saw that too i hope that they will report it.