Companies affiliated with Alcoa and controlled by a billionaire businessman paid $9.5 million in bribes to Bahrain officials and executives with a Bahrain-controlled company that overpaid for raw materials as a result, the Middle Eastern firm said in court papers.

The complaint filed late Monday in Pittsburgh federal court by Aluminum Bahrain BSC details allegations previously described more generally in a 2008 lawsuit. The company, known as Alba, said it overpaid $420 million for raw materials from 1997 to 2009 and wants $1 billion in damages.