Job losses at Trump Plaza will be even worse than expected when the boardwalk casino in Atlantic City shuts down in September.

Trump Entertainment Resorts began mailing notices to its workers on Monday, informing them that, while a final decision has not been reached, management expects to close the casino on Sept. 16.

The notice said 1,153 people will lose their jobs, up from estimates of just more than 1,000 last week.

Trump Plaza, which opened in 1984, has been the worst-performing of Atlantic City's 11 casinos, and it is one of three casinos currently operating that could close before fall.

The Showboat is closing Aug. 31, and Revel said it will shut down if a buyer can't be found in bankruptcy court.

The Atlantic Club closed in January.

Trump Entertainment also operates the Trump Taj Mahal Casino Resort on the Atlantic City boardwalk. The company, after going through bankruptcy, sold its Trump Marina casino and hotel in 2011 to Landry's Inc., which now operates it as the Golden Nugget Atlantic City.