BRIEF-Ambac files lawsuit in response to extension by Puerto Rico Highways and Transportation Authority of Concession Agreement
May 11 (Reuters) - Ambac Financial Group Inc
* Ambac assurance filed a lawsuit in response to extension by puerto rico highways and transportation authority of concession agreement
* Complaint alleges breaches of contract and fiduciary duty and seeks appointment of an interim receiver for prhta
* Lawsuit may cause $115 million in value to be extracted and diverted from prhta
* Says in addition, complaint alleges prhta's failure to take advantage of $750 million in federal toll credits Source text for Eikon: Further company coverage: (Bengaluru Newsroom: +1-646-223-8780)
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