A concrete plant on the edge of Saskatoon was heavily damaged by an early-morning fire Saturday. (Dan Zakreski/CBC)

A Saskatoon concrete business was left a smouldering ruin Saturday after an overnight fire consumed most of the premises.

Fire crews were still on the scene at 8:30 Saturday morning, dealing with hot spots.

The blaze, at Taylor Concrete and Pumping, lit up the night sky.

The fire was noticed at 4:40 a.m. Saturday.

Four fire trucks rushed to the scene to find the front office building on fire and a large part of the concrete plant also burning.

With no immediate access to a fire hydrant, firefighters sprang into action to move several trucks away from danger. They also called for water tankers to come and assist and began shuttling water from hydrants in a nearby neighbourhood.

The concrete plant is located just outside of Saskatoon's city limits.

"We do not know at this point what the cause or the origin of the fire is," Sgt. Gregg Abbott, a spokesman for the RCMP, told CBC News Saturday morning. "The investigation is ongoing."

Abbott added that people associated with company were very upset with the loss.

"It's just a really tough time right now for the owners of the business as well all the employees," Abbott said.

The fire department reported that the fire caused millions of dollars in damage and put about 30 employees out of work.

There were no injuries in the blaze.

The concrete plant is just on the outskirts of Saskatoon, on a road known as the 8th Street extension.