(Adds police comment on suspected cause of fire and damages)
ZURICH, July 11 (Reuters) - A fire broke out at a chocolate factory at Lindt & Spruengli's headquarters in Kilchberg near Zurich on Tuesday but was quickly extinguished, Swiss police and the company said.
Two people sustained slight injuries and the Zurich cantonal police said investigators suspected a machine overheating was the cause of the fire.
"We had to evacuate the building, a few people appear to have suffered smoke poisoning," a spokeswoman for the cantonal police said.
The police said the cost of the physical damages to the factory would amount to several thousand Swiss francs.
Lindt & Spruengli, which owns the Russell Stover brand of chocolates in the United States, is known for its gold foil-wrapped Easter chocolate bunnies and Lindor chocolate balls. The company has factories in Switzerland, Germany, Italy, France, Austria and the United States. (Reporting by Silke Koltrowitz and Joshua Franklin; Editing by Mark Potter and Susan Fenton)