San Jose fire department warned people to not touch the foam, as it can cause skin irritation.
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Firefighters are on the scene.
The foam has flooded the hangar at San Jose airport and is blowing into surrounding surface streets. Fire officials say foam was released after a fire alarm malfunctioned at the hangar, which deals with jet planes.
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The hangar is owned by Signature Flight Support and accommodates large cabin sized aircraft. They provide support services like aviation fueling.