A second Bulgarian weightlifter has been stripped of his gold medal after tests showed he took a banned weight-loss drug, the International Olympic Committee said Saturday.

The weightlifter, Anguel Anguelov Guenchev, set three world records in winning the 1481/2-pound class, which now apparently will be wiped from the books. The gold medal apparently will go to an East German who finished second.The IOC also announced that a second modern pentathlete, Jorge Quesada of Spain, had tested positive for drugs and been expelled from the Seoul Games. It said he had used a drug aimed at steadying his shooting hand in the marksmanship portion of his event.

Both Guenchev and Quesada could face further penalties from the international governing bodies of their sports.

The actions brought to four the number of athletes expelled from these Games after positive tests for doping.

An IOC official said the disqualifications and lost titles served as a warning to athletes considering drug use.

Michele Verdier, the IOC spokeswoman, also said the Bulgarian team had acknowledged the violation and apologized.

Guenchev, competing Wednesday, set world records of 7971/2 pounds for his total lift, 352 pounds in the snatch and 4451/2 pounds in the jerk.

It was not immediately known what would happen to the medal standings. The IOC said only that the "the gold medal has been withdrawn" from Guenchev and International Weightlifting Federation officials were unavailable for comment.

On Thursday, his teammate, Mitko Grablev, was stripped of his gold medal in the 123-pound class, which he had won with an Olympic record total. The Bulgarian delegation condemned his action and sent him home, and the federation then banned him from international competition for two years.

Both weightlifters were found using furosemide, a diurectic. Such drugs can be used to quickly lose water weight in weight-class sports such as lifting, but they also can help hide other illegal drugs, such as muscle-building steroids.

For Quesada, a urinalysis showed the presence of propanolol, a beta-blocker, Verdier said.

She said beta blockers are used to help ease nerves and control the body, and first were used by shooting competitors before spreading to other sports.

The modern pentathlon - a five-day competition in riding, swimming, fencing, shooting and running - held its shooting competition on Wednesday.

After Monday's fencing portion, Alexander Watson of Australia was disqualified. The IOC said he had excess levels of the stimulant caffein in his urine. Watson stood 12th after the four events he had completed before his disqualification was announced.

Verdier said the decisions on the four all are final and that the athletes and their coaches already have had a chance to present their cases to the IOC Medical Commission.