They were taking part in the International Karate/Kobudo Championships.
Competitors take part in multiple styles of karate and are judged on form and techniques.
Members of "United States Karate-do Kai" say some of the world's best are at this competition.
Karateka Lucky Phillips said, "Members from all over the world come here to compete and to show their skills and to test their skills against their peers. If you win this, that means you're top of the heap."
The championships have been held in Peoria for 30 years.
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