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The city civic body had installed smart traffic polls near a mall in Goregaon (east) suburb. A contractor had placed two LED screen boards on one of the polls for displaying traffic-related advisories.
At 9.10 pm on Thursday, an abusive message was displayed on the LED screen, the official said on Monday.
The message remained there for more than an hour before the power supply to the board was cut off, he said.
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He told the police that somebody might have hacked into the system and relayed the message.
A case was registered against unidentified hackers under related sections of the Indian Penal Code and the Information Technology Act, the police official said.