Lasernigel:
It might not, but the report does not say it was brought down by a missile, in fact the type of SAFIRE (Surface to Air Fire) has not been revealed. Self sealing tanks and inert gas to prevent explosion/fire may help for AAA rounds, which is what is reported in the press today as being responsible for bringing the ac down.
The Sun (I know, its the Sun, therefore it must be true) mentions a DShK .5 cal MG, and other rags refer to 'machine gun fire'. The report, IIRC, refers to a combination of ground fire.
GW