A Western Pennsylvania judge on Friday afternoon granted Highmark Inc.'s motion for a preliminary injunction againstWest Penn Allegheny Health System, the Pittsburgh Tribune-Review reported.

The ruling by Christine Ward of the Allegheny County Court of Common Pleas means West Penn, teetering under $737 million of junk-level bond debt, cannot negotiate with other suitors. West Penn is one of the largest speculative-grade issuers in the municipal marketplace.

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