A federal mediation session failed to bring Teamsters Local 25 and Republic Services to an agreement that would end a garbage collection strike affecting more than a dozen Massachusetts towns.

Sanitation workers in Philadelphia could go on strike as soon as Tuesday, stopping regular residential trash pickup in the city.

Philadelphia residents have been warned to brace for a largescale workers' strike designed to shut down key infrastructure, such as garbage removal, starting Tuesday. Roughly 9,000 staff belonging to the city workers' union―the American Federation of State,