Google's legal troubles over the online marketing services it provides may have worsened after the firm was subject to a new anti-trust complaint.
The new allegations have come from South Korea's two top search engines, Daum and NHN Corp, who told the country's Fair Trade Commission the US giant's practices restrict competition.
Google is already involved in an investigation by the European Commission following complaints from competitors there that they have been unfairly demoted in the firm's search results.
According to the Korean companies, the new concerns relate to restrictions on Google's Android smartphone operating system that prevents other providers from offering search services on the platform.
A statement from NHN said: "Through a marketing partnership with major smartphone producers, Google has prohibited other market players from pre-installing their search window or related applications."
Google has denied the accusations and has said it will co-operate fully with any investigation.
It stated that Android is an open platform and mobile operators are free to decide what applications they include on their phones.
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