Navyanon here. From basic firefighting training:
Class Alpha fire - white smoke; combustible materials leave an ash (wood, paper, etc.)
Class Bravo fire - thick black smoke; petroleum-based products
Class Charlie fire - bluish, acrid smoke; burning wire insulation and electrical/electronics; caused by electrical power
Class Delta fire - very little smoke; extremely bright, white hot fire; cannot be extinquished; materials provide their own heat, fuel and oxygen when ignited; self-sustaining; only means of combatting are jettison or let it burn to self-extinguishment (road flares is an example; magnesium, aluminum, phosphorus and other source materials)
This looks like an Alpha fire.