A “massive” industrial fire at an out-of-use cannabis-growing facility in Delta, B.C., sent up a mushroom-shaped cloud of smoke early Sunday morning.

Police in Delta say they are on scene with fire crews on Hornby Drive in Delta, not far from the intersection of Highway 99 and Ladner Trunk Road.

The fire involves a warehouse with an attached greenhouse, say Delta police.

“Officers noted the smoke coming from the area at roughly 7:30 a.m. and (the fire department) was dispatched at roughly the same time,” reads a police statement.

“The fire is massive and (the fire department) has multiple units on scene,” the statement continues.

Legal cannabis producer Canopy Growth told The Canadian Press the fire is located at a facility that has not been in operation for several months.

In a news release Saturday afternoon, the City of Delta said seven fire crews totalling 30 firefighters responded to the second-alarm blaze. They were able to contain the fire to the shipping and receiving section of the structure and prevent the blaze from spreading to other nearby buildings, the city said.

The fire "is now in the late stages of extinguishment," the city said in its release, which came out around 1 p.m. Fire crews will remain at the scene until the fire is extinguished.

"The battalion chief on scene confirmed with the structure manager that there were no chemicals or fertilizers in the affected building," the city said. "There is currently no indication of toxic or hazardous smoke that may harm residences in the surrounding area coming out of the fire."

No firefighters were injured in the blaze, the city said, adding that the cause of the fire is still under investigation.

With files from The Canadian Press