The International Olympic Committee said Friday it will step up its investigation into the Jones case and the possible removal of her three gold and two bronze medals from the 2000 Sydney Games.

"We welcome that there is now some light to be shed on the whole affair," IOC vice president Thomas Bach told The Associated Press. "Now, with this admission, we can accelerate and speed up the procedures."

The IOC opened its investigation in December 2004 after Jones was implicated in the BALCO steroid scandal. The American runner — the only female track and field athlete to win five medals at a single Olympics — repeatedly denied any wrongdoing, and the IOC had little firm evidence to go on until now.

Jones was scheduled to appear Friday afternoon in U.S. District Court in White Plains, N.Y. to plead guilty to charges in connection with steroid use, a federal law enforcement source told The Associated Press. The official spoke on condition of anonymity because the investigation is ongoing.

Jones also sent family and close friends a letter in which she said she used steroids before the Sydney Games, The Washington Post reported Thursday.

Bach said the IOC would work in tandem with track and field's governing body, the International Association of Athletics Federations, to determine whether Jones should have her medals and results taken away.

"We can move quite quickly," said Bach, a German lawyer who leads the IOC's three-man panel investigating the Jones case. "With the admissions, the facts are quite clear. I think it can be finalized by the end of the year."

The ruling IOC executive board's next meeting is scheduled for Dec. 10-12 in Lausanne, Switzerland.

Under statute of limitations rules, the IOC and other sports bodies can go back eight years to strip medals and nullify results. In Jones' case, that would include the 2000 Olympics, where she won gold in the 100 meters, 200 meters and 1,600 relay and bronze in the long jump and 400 relay.

The standings normally would be readjusted, with the second-place finisher moving up to gold, third to silver and fourth to bronze.

Standing to inherit Jones' gold medal in the 100 would be Greek sprinter Katerina Thanou, who finished second in Sydney in 11.12 seconds.

Thanou and fellow Greek runner Kostas Kenteris were at the center of a major doping scandal at the 2004 Athens Olympics. They failed to show up for drug tests on the eve of the games, claimed they were injured in a motorcycle accident and eventually pulled out. Both were later suspended for two years.

Without firm evidence or an admission that Thanou was doping at the time, there may be no legal way to prevent her from getting the gold if it's taken from Jones.

"It's very unfortunate," IAAF spokesman Nick Davies said. "The second place (finisher) is a convicted drugs cheat."

Jones now admits she took "the clear" — the steroid THG — for two years, beginning in 1999, and that she got it from former coach Trevor Graham, who told her it was flaxseed oil, the Post reported.

In her letter, Jones said she didn't realize she'd used performance-enhancing drugs until she stopped training with Graham at the end of 2002, the newspaper reported.

"If the reports are accurate and if she does in fact acknowledge steroid use at the Sydney Olympic Games then that's a good thing," Australian Olympic Committee chief John Coates said. "But it's still very, very disappointing for all of the athletes that competed against her. ... I don't think an acknowledgment now will ever right the injustice for those other ladies."

"I would hope the medals would be taken away," he said.

Jones also could face a long competition ban from the U.S. Anti-Doping Agency.

The IAAF said it was waiting for official notification from USADA setting out the details of Jones' reported admission.

If she admits to having been on drugs during a specific period, the IAAF could strip Jones of all her medals and results from the world championships and other events from that time.

"Our rules are clear," Davies said.

Jones won a gold (100 meters) and bronze (long jump) at the 1999 worlds in Seville, Spain, and two gold (200 and 400 relay) and a silver (100) at the 2001 championships in Edmonton.

Under IAAF rules, athletes busted for doping also can be asked to pay back prize money and appearance fees. It's unclear whether this would be applied to Jones, who would have earned millions in prizes, bonuses and fees from meets all over the world, including a share of the $1 million Golden League jackpot in 2001 and 2002.

British sprinter Dwain Chambers, who admitted using designer steroid THG, had to pay back a reported $230,615 before he was allowed to return to competition after a two-year ban.

What would happen to the U.S. relay team medals won by Jones is also uncertain.

After a long legal case, the Court of Arbitration for Sport ruled in 2005 that only Jerome Young should be stripped of the gold medal won by the United States in the 1,600 relay in Sydney.

The IOC, IAAF and World Anti-Doping Agency had pushed for the entire team — including Michael Johnson — to be stripped of the victory. Young tested positive for steroids in 1999 but was cleared by a U.S. panel on appeal and allowed to compete in Sydney. He ran in the preliminaries but not the final.