The Super Mystère Aircraft Collection

This is my mystery to not say my super mistery picture... What happened to venerable Sioux to send such a quantity of white smoke? Fire, oxygen problem or war declaration against greyhounds and condors of EC 2/4 'Dauphiné' Squadron or other event??? Drop me a line, I give the answer next Monday and into API N° 13 Edito on 2 July.
Aligned with parking, background, the Base and Wing Commanding Post with attached control tower.