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Alderman Ted Hess-Mahan, local activist Tom Sheff, and whistle blower Jackie Gauvreau Sequeira, have all turned in signatures in time to challenge Mayor Setti Warren this fall , Newton Patch and Boston.com report.

The preliminary election will be held Sept. 17 to narrow the  field to two candidates.  The finals will be on Nov. 5.

There will also be a preliminary election contest for Ward One voters between  Allan Ciccone Sr., Alison Leary and Roger A. Marrocco for ward aldermen.