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
Thousands of people turned out for Nottingham Pride earlier on today - did our cameras catch you?
Wheelchair tennis player Jordanne Whiley beat Aniek van Koot in straight sets to become champion for the second year running.
Sunny spells for most with showers possible this afternoon.