The International Olympic Committee on Wednesday stripped four track and field athletes of the medals they won at the 2004 Games in Athens for doping violations after reanalyzing their urine samples and detecting steroids.

The athletes are Yuriy Bilonog of Ukraine, who won gold in men’s shot put; Svetlana Krivelyova of Russia, who won bronze in the women’s shot put; Ivan Tsikhan of Belarus, who won silver in the men’s hammer throw; and Iryna Yatchenko of Belarus, who won bronze in the women’s discus.