SEOUL, South Korea (AP) _ Referees at this year's World Cup were told Thursday to crack down on players who attempt to win penalty kicks and free kicks by acting.

Lim Eun-joo, a South Korean organizer, said during seminar attended by 72 referees and linesmen that players guilty of ``simulation and cheating play'' will be given yellow cards. Referees viewed about 50 video clips Thursday covering various offenses.

On Friday, the referees will be given fitness tests at Olympic Stadium. They must run 2,700 meters in 12 minutes, 200 meters in 32 seconds, and 50 meters in 7.5 seconds. They also must pass medical and drug tests.