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
A cold and mostly dry day, with wintry showers becoming more confined to coasts. Brisk winds, especially near coasts.
A mostly dry day with sunny spells. Wintry showers from late afternoon in the west and north, perhaps falling as snow to lower levels.
Isolated wintry showers perhaps giving further, mainly slight, snow accumulations inland.