63 workers trapped underground for hours during fire at Nutrien potash mine in Sask.

Dozens of workers had to spend several hours underground when a fire broke out at a central Saskatchewan potash mine Tuesday morning. 

Nutrien says the blaze occurred sometime after midnight at its operation near Allan, about 60 kilometres southeast of Saskatoon.

The company says 63 workers took shelter in underground refuge stations while emergency crews handled the fire.

The workers were brought to the surface shortly before 8 a.m.   

There were no reports of injuries.