Guess not all of Smaug's fire was CGI!
Thankfully, no one was injured. A large generator (about the size of a shipping container) caught fire around 5pm yesterday. Fire crews quickly arrived at the scene and the fire was doused in just twenty minutes. No one was injured, and the extent of the damage appears to be limited to the generator. As soon as the fire was put out, filming was resumed!
Sources: TVNZ; Stuff.co.nz