Protests have been reported at Peenya, Rajajinagara, Yeshwanthpur, Jayanagara, Mysuru Road and Chickpete metro stations and Hindi wordings on the signages were blackened on a few of them, officials said.
They said following the protest, security near most of the metro stations in the city has been tightened by deploying additional forces.
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As the activists tried to block the entrance of metro stations by staging the protest, police removed them and at a couple of stations protestors were detained, police said.
Signages in Hindi at at least two metro stations in the city were covered earlier this month, following protests by pro-Kannada activists and on social media against "imposition" of the language.
The protest against the "imposition" of Hindi in Bangalore metro triggered by the online campaign "#NammaMetroHindiBeda" has been gaining momentum since the beginning of this month.
Kannada Development Authority (KDA) had also issued a notice to Bangalore Metro Rail Corporation Limited (BMRCL) on the issue.
Chief Minister Siddaramaiah during his recent visit to Delhi had reportedly said he would lodge a protest with the Centre on "imposition" of Hindi.
Recently, few activists belonging to a pro-Kannada outfit had defaced the name board of a few shops at a food court here for not bearing content in Kannada.
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