China Anti-Doping Agency on Thursday called on the International Testing Agency to intensify testing of the U.S. track and field athletes during the Paris 2024 Games, saying it suspects a systemic doping problem.

"Given the deep-rooted stains in the U.S. athletics and the United States Anti-Doping Agency's repeated disregard for procedures and standards, there is reason to suspect that there is a systemic doping problem in track and field in the United States and the positive cases therein deserve continuous investigation and attention," it said in a statement.