The cause of Monday’s townhouse fire in Waipahu has been classified as undetermined.

Fire officials today said that there was a lack of specific evidence to determine the exact cause.

Honolulu firefighters rescued two women from the second floor of a burning townhouse in Waipahu early Monday morning.

Firefighters arrived at the Oasis Townhomes at 94-207 Waipahu St. at 12:21 a.m. to find a two-story townhouse building with smoke and flames coming from the bottom of the unit.

Two women, who were alerted to the fire by the commotion, were trapped upstairs in their unit, Honolulu Fire Department officials said.

Firefighters used a ladder to rescue the two women through a window.The two treated for smoke inhalation and transferred to the care of Emergency Medical Services personnel, officials said. The women, ages 23 and 26, were treated at the scene and taken to a hospital in serious condition, EMS said.

HFD said that nine units, with 31 personnel, responded and had the fire under control at 12:28 a.m. and extinguished at 12:32 a.m.

They said the unit had a smoke alarm, but the occupants did not hear it.