ROCHESTER, N.Y. — Hundreds of layoffs are coming to the General Motors plant in Rochester. 

Local United Auto Workers President Dan Mahoney says layoffs will happen in August and will impact about a third of the plant's hourly workforce.  

Mahoney says General Motors is eliminating those jobs because it is switching to a new supplier for fuel injectors.

Another round of layoffs is expected in 18 months as General Motors begins switching to producing more electric vehicles,  according to Mahoney.