During 1952 flap, 20 July, Morocco. A.M. Petitjean saw a saucer take off at Dai-el-Aouagri; it gave out blue flashes and a powerful smell of burning sulfur.
From: Peter Brookesmith - UFO the complete sightings catalogue.
Islamic UFO files, by Alfredo Lissoni,
Italy's National UFO Center.