A federal mediator was scheduled to meet with members of the Teamsters Local 25 and the trash company providing garbage services in more than a dozen Bay State cities and towns on Tuesday.

State leaders urge Republic Services to finalize contract with striking Teamsters as uncollected garbage piles up in Massachusetts communities and other states across the country.

Negotiations between Republic Services and Teamsters broke down late last week. Talks are set to resume Tuesday, but the impacts of the trash strike are growing more pronounced.

Municipal leaders from 13 affected cities and towns sent Republic Services a letter decrying costs, delays and dangers of the 11-day strike.

As work stoppages spread, the Teamsters’ president says a waste disposal company is at “war” with sanitation workers.