Text in Hindi language on signages at the BSNL office and the Post Office outside Trichy Airport was painted black on Saturday by unidentified people.
The incident comes after a controversy erupted over the three-language formula proposed in the draft of Centre's new National Educational Policy.
All the parties in Tamil Nadu protested against what they alleged was "imposition of Hindi" on non-Hindi speaking states.
The Central government, however, clarified that it was just a draft put up for discussion and that no policy decision has been made by the government in this regard.
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