OTTAWA - The union representing Canada Post employees says 800 workers have walked off the job in Kitchener and Waterloo as rotating strikes continue across the country.

The Canadian Union of Postal Workers says the walkout started Friday just after midnight.

CUPW also says workers in Moncton, N.B., joined the picket lines Thursday evening, along with union locals in Hamilton, Ottawa, North Bay, Ont., Regina and Outaouais-Quebecois, Que.

The union and the postal service have been unable to reach new collective agreements for two bargaining units after 10 months of negotiations.

Canada Post says it has provided "significant" offers to its employees, including wage hikes, but CUPW says it falls far below expected cost-of-living increases.

The strike at the Kitchener-Waterloo local comes a day after CUPW called for a national overtime ban, meaning postal workers can refuse to work beyond their normal eight-hour days.