Two Alaska Airlines flight attendants were treated after falling ill during a flight from Seattle to San Jose, California, on Thursday evening.

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Alaska Airlines officials said flight attendants on Flight 322 noticed a light, white, powdery substance coming out of a galley ceiling vent

The flight landed just before 7 p.m. at Mineta San Jose International Airport and the San Jose Fire Department responded with hazmat units.

Officials confirmed that powder fell from an air vent and triggered a hazardous material response.

Crews inspected the substance and it is believed to be residue left over after de-icing the plane. Alaska Airlines officials said the de-icing fluid is non-toxic.

One flight attendant was taken to the hospital.

There were 180 passengers on the flight along with six crew members. Passengers did not report feeling sick.