The Labour candidate for the London Assembly seat in Brent and Harrow has been reported for "exploiting ethnic and religious differences" during campaigning.
Councillor Navin Shah, also leader of the Labour group on Harrow Council, has been reported by fellow councillor Jeremy Zied to the Standards Board of England.
Cllr Zied (Conservative member for Kenton West) has accused his colleague of seeking to divide the borough's population and damaging the name of the council with campaign leaflets.
He particularly highlighted an "offensive" cartoon of Conservative London mayoral Boris Johnson published in a recent leaflet, and other incidents in the past including leaflets only sent to "Indian sounding names".
Cllr Zied said: "I have no problem with what is the normal political knockabout, which is par for the course.
"However, I firmly believe that the actions of Cllr Navin Shah and his Harrow Labour campaign are straying into the politics of race, creating and exacerbating ethnic and religious division to exclude and alienate the wider community."
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The Standards Board of England monitors the ethical conduct of councillors, London Assembly members and members of a range of other public service organisations.
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