Philadelphia's unions, facing an ultimatum to approve a new contract by 5 p.m. tomorrow, are expected to reject the mayor's "last best offer" and have filed a grievance with the slate alleging unfair labor practices.

It remained unclear late yesterday when or if a strike would result, as the standoff continued between Mayor Edward G. Rendell and two of the city's biggest unions, district councils 33 and 47 of the American Federation of State, County and Municipal Employees.

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