SHANGHAI/TOKYO -- Chinese authorities investigating allegations of expired food sold at Burger King have broadened their probe nationwide and are looking into other U.S. fast-food chains.
KFC and McDonald's also face spot-checks as diplomatic tensions rise

McDonald's outlets in China are also being investigated. © Reuters
SHANGHAI/TOKYO -- Chinese authorities investigating allegations of expired food sold at Burger King have broadened their probe nationwide and are looking into other U.S. fast-food chains.