New York ? Four more people were charged Thursday in the scandal in the U.N. oil-for-food program, including a Texas oil executive and a South Korean businessman who was at the center of a 1970s corruption case involving Congress.

The indictment also suggested that money skimmed from the oil program might have ended up in the hands of two U.N. officials. Their names were not released.

The oil-for-food program was created in 1996 to help Iraqis cope with a U.N. embargo imposed on Saddam Hussein’s regime. The program let Saddam’s government sell oil, provided the proceeds were used to buy food and medicine for Iraqis.

But authorities allege the program was rife with corruption.

U.S. Atty. David Kelley called the new charges “two more pieces in the oil-for-food puzzle” and said the investigation was not over.

“We’re going to wring the towel dry,” he said.

One of the indictments announced Thursday charges a Texas oil company owner and two oil traders with paying millions in secret kickbacks to Saddam’s regime to secure oil deals, thus cheating the program out of money for humanitarian aid.

The fourth person charged was Tongsun Park, a South Korean citizen and fugitive who allegedly accepted millions of dollars from the Iraqi government while he operated in the United States as an unregistered agent for Baghdad.

In the 1970s, Park was at the center of what became known as the Koreagate scandal, in which he was accused of trying to buy influence in Congress.

The charges were announced at a news conference where an FBI official said the oil-for-food program was doomed when it let Saddam control who was able to buy Iraqi oil.

The indicted oil executive and traders are David B. Chalmers, sole shareholder of Bayoil (USA) Inc.; Ludmil Dionissiev, a Bulgarian citizen and permanent U.S. resident; and John Irving, a British citizen.

Chalmers and Dionissiev were arrested Thursday at their homes in Houston.