SAN JOSE (KRON) — A substance on an Alaska Airlines flight triggered a hazmat response Thursday night at Mineta San Jose International Airport.

The substance, on board Flight 322 inbound from Seattle to San Jose, triggered a hazmat response Thursday night, according to airport spokeswoman Rosemary Barnes.

The incident happened at around 6:30 p.m.

Upon descent, a flight attendant seated in the front galley noticed a light powdery substance coming out of the galley ceiling vent intermittently, an Alaska Airlines spokeswoman said. En-route to SJC, three flight attendants stated they did not feel well.

The crew requested medical attention when they landed. One flight attendant was sent to a local hospital for further treatment.

The plane landed safely about 15 minutes later and is currently at Gate 26.

San Jose police and firefighters responded to the scene.

The substance ended up being residue left over from deicing the plane, the airline spokeswoman said. The deicing fluid the plane uses is non-toxic and it is called glycol.

Out of an abundance of caution, passengers were being held on board as the situation was being accessed.

181 passengers and six crew members were on board the flight.

There were no reports of passengers affected.Stay with KRON4 News on this developing story.