Six women working at a kidney dialysis center in Leeward Oahu were treated by paramedics and taken to a hospital this morning after reporting smelling an unknown chemical odor.

City Emergency Medical Services officials said the six women— ages 56, 54, 55, 46, 45 and 35 — at the Hawaii Dialysis Center on Fort Weaver Road near the Queen’s Medical Center-West were taken to the hospital at 5:47 a.m. after they reported being exposed to an unknown chemical odor.

Capt. David Jenkins, Honolulu Fire Department spokesman, said firefighters and the department’s hazardous materials special team were unable to locate the source of the odor although there is a construction site next to the center.

The center was evacuated and checked and the occupants were allowed back into the building at 5:57 a.m.