Eyewitnesses have told ITV News Central a number of loud explosions could be heard from the fire at G&P batteries in Darlaston, Walsall.
50 firefighters are currently tackling the blaze on Willenhall Road.
More top news
Newark castle was bombarded with cannon fire this weekend as visitors flocked to the opening of the UK's first Civil War museum.
A mostly fine and dry day.
Drier and brighter today but becoming wet tonight.