Firefighters from across West Yorkshire are tackling a huge blaze in West Vale.
People have reported hearing explosions in the area.
A West Yorkshire Fire and Rescue Service spokesperson said a building at North Dean Business Park is heavily involved in the fire, but there are not thought to be any people involved.
Emergency services were called at around 10.20am and 10 fire engines from across the region are in attendance.
Volunteers from the Canal and River Trust who have been based at the Salterhebble lock said that fire engines were already down at the business park before the explosions went off.
“There was one big explosion before a massive second one.
“It was like a firework storage factory had gone up.
“You could feel the shockwaves through the trees and in the air.
“The smoke then rose to about 40 feet in the air and it came across the road towards the bypass.
“The fire and smoke was quite considerable when it go going.”
Stainland Road is currently closed, buses are being diverted, and there is severe disruption on the trains.
Local residents are urged to keep windows closed and stay away from the area.
More to follow.