New Delhi, May 17 -- At least 1,000 voters have been deleted from electoral rolls in a West Bengal assembly constituency following a security breach that began in September 2023, people familiar with the matter have said.

Election Commission officials confirmed the breach took place in electoral roll management where login credentials of four Assistant Electoral Registration Officers (AERO) were stolen, but said the extent of the records or voters affected has not yet been verified.

"I was informed by the South 24 Parganas district magistrate that breach may be going on since September 2023, as found during the enquiry by the ERO," said West Bengal Chief Electoral Officer Manoj Kumar Agarwal.

"In this case, the assistant system manager...