Police have stepped up patrols at Churchill County High School after a string of fights, including one that injured the assistant principal.
Assistant Police Chief Ray Dolan said some of the fights last week at the school located 60 miles east of Reno were racially motivated.
Dolan said they stemmed from tensions between two rival groups - the "White Sox," which consists of black and American Indian students plus a few whites, and "Brown Pride," which includes Hispanic and white students.
Dolan said "Brown Pride" is affiliated with a gang in Reno, but he doesn't consider the "White Sox" a gang. Each group consists of 20 to 30 teens.
He said the fights would not be tolerated.
"It's zero tolerance as far as we're concerned," Dolan told the Lahontan Valley News and Fallon Eagle Standard newspaper. "Between the school, juvenile probation department and us, it's zero tolerance. We're not going to stand for it."
The fights erupted Monday, and police stepped up patrols after a fight Thursday in the cafeteria injured Assistant Principal John Hyatt.
Hyatt was punched in the face as he tried to quell a fight between a 17-year-old male student who hit a female in the back of the head and her boyfriend, police said.
After that fight, several smaller fights broke out among other groups of students.
"To eliminate any chance of students being injured they were told to go back to class and were not allowed to leave class until the problem was under control," Dolan said.
A search of about 30 students and their lockers on Friday turned up no weapons, he said.
"With the cooperation of the school district, juvenile probation and our agency, the appropriate manpower was gathered to beef up patrol and security measures around the school the entire day (Friday)," Dolan said, adding the increased security will continue.