Shares of the company, which operates the Caesars Palace and Flamingo casinos on the Las Vegas Strip, fell as much as 9 percent on Monday.
In a regulatory filing on Monday, the company also said its Desert Palace subsidiary, which operates Caesars Palace, said it had received a letter from the financial crimes unit of the U.S. Department of the Treasury about "alleged violations of the Bank Secrecy Act".
Caesars also said a federal grand jury was conducting an investigation into the matter.
Caesars is saddled with more than us$ 20 billion in debt incurred when it was acquired in 2008 by private equity firms Apollo Global Management and TPG Capital, both of which remain major shareholders. Billionaire John Paulson is also a shareholder in Caesars.
Caesars Entertainment holds a minority ownership, and has a management agreement related to operating a casino, with Sterling Suffolk Racecourse, owner of Suffolk Downs racecourse in East Boston, Massachusetts. Sterling Suffolk recently made a bid for a casino license at its facility.
The company's withdrawal from the Suffolk Downs project is a major blow to Caesars. CEO Gary Loveman said in September that the proposed casino would draw elite international gamblers, making it one of the best cash-making opportunities in the U.S. gaming industry. The report by the Massachusetts Gaming Commission, issued on October 18 and not yet public, raised a number of issues, Caesars said. These issues included the company's financial condition and its business relationship - since terminated - with a partner in a particular hotel project, the company said.
Although Caesars strongly disagrees with the director’s recommendation, the company has decided to withdraw its application as a qualifier in Massachusetts for the benefit of Sterling Suffolk. Caesars also said it was unable to determine the outcome of the federal investigations. The company could not immediately be reached for additional comment. Shares of the company were down 7 percent at us$ 17.40 in afternoon trading on the Nasdaq.