5 Fighter jets chasing 21 UFOs in Brazil, May 19, 1986

"On May 19, 1986, 21 unidentified flying objects, some of them up to 100 meters in diameter, were sighted by multiple witnesses, both civilian and military, in four states: São Paulo, Rio de Janeiro, Minas Gerais and Goiás." "Five Brazilian Air Force fighter jets were activated by the Air Defense Operations Center to intercept the alleged invaders." -- Government of Brazil