Fire crews responded to the Hawaii School for the Deaf and the Blind in Kapahulu Friday morning because of an unknown odor.

The first call came in just before 9:45 a.m.

One school official said a counselor and a speech language teacher left because of the unknown smell.  One of them is pregnant and the other was breastfeeding.

Fire crews left by 10:30 a.m.  Officials say although the source of the smell was never found, there was a possibility it was the insecticide malathion.