PALTO ALTO, Calif
(KTVU & Wires) -- Twelve people exposed to a suspicious odor at a hotel in Palo Alto were hospitalized Thursday night.
Palo Alto fire officials responded to the Westin Hotel on El Camino Real to a report of a suspicious odor coming from the hotel's parking garage.
A hazardous materials team was called to the hotel, but investigators were not able to determine the cause of the irritant, according to fire officials.
The scene was cleared shortly after midnight, and fire officials said it appears the irritant was vented out of the garage and had dissipated.
Eight patients were transported to Stanford Medical Center, and four patients were transported to El Camino Hospital for treatment, officials said.
Details on their conditions have not been released.
Hotel guests were asked to shelter in place while hazardous materials teams from Palo Alto and Mountain View investigated the incident.
"We are pleased that all guests and associates who were initially taken to the hospital to be checked have been released," said Jessica Doyle, a Starwood Hotels and Resorts representative. "We sincerely appreciate the Palo Alto Fire Department’s quick action and support."
Fire officials first reported the incident Thursday 10:37 p.m.