"The Brazilian airspace was invaded by twenty-one objects of unknown origin, which were detected by radar, were accompanied by jet aircraft, moved at high speeds, going from 250 to 1500 km/h in a fraction of a second, without causing the characteristic boom, changed color, changed course, rose, fell, instantly disappeared from the radar and appeared in the eyes of the observer, in another place, accompanied the planes were parked, were zigzag, caused the interruption of air traffic in various areas, saturated the radars have caused interference in the equipment of jet planes, made curves at right angles (90 degrees) at very high speeds"

source: [link to arquivoconfidencial.blogspot.com]