BEIJING, China -- There were two more positive drug tests at the Olympics on Friday, as North Korean pistol shooter Kim Jong Su and Vietnamese gymnast Thi Ngan Thuong Do being the guilty parties.

Kim tested positive for propanolol, a betablocker that limits trembling. His silver medal was taken away from the 50m pistol. Because of the doping test, China's Tan Zongliang was elevated to the silver and Russia's Vladimir Isakov moved up to grab the bronze. Kim's bronze in the 10-meter air pistol was also taken away and was given to the fourth place finisher, American Jason Turner.

Do, who was in last place in the women's floor exercise qualifying, tested positive for the diuretic furosemide.

Friday's announcement brings the total to three athletes who have tested positive at these Games. The International Olympic Committee released a report Friday saying to date there have been 2,203 tests, and that included 483 blood tests. Out of those 2,203, 1,250 have been conducted before the Olympics.

"The cheats are not way ahead," said Arne Ljungqvist, chairman of the IOC medical commission. "We are on the heels of those who try to cheat. That has been the case over the last five or six years."