Research news
Bitesized UFOs #053: Diamond Shaped UFO over France, 1967
A strange diamond shaped UFO, emitting smoke or mist, was seen in the vicinity of Besancon, France, in early October 1967. The witness raced by car to a higher vantage point and was in time to see the odd shaped object explode - only for two objects to appear in the smoke. Another intriguing tale from Bitesized UFOs!
See more (external link) 
https://www.youtube.com/watch?v=BT7FTjy3d0Y