Emergency crews on Friday morning responded to a two-alarm fire at a mushroom warehouse in Morgan Hill. The blaze was reported at Monterey Mushrooms, located at 642 Hale Avenue. Firefighters said the fire was first reported as a blaze in an office, but when crews arrived on scene the fire spread to a nearby mushroom warehouse. About half of the mushroom warehouse was destroyed in the blaze before crews were able to knock down flames. No injuries were reported and a cause is under investigation.