Lincoln police got called to a fight involving 30 people at Antelope Park near 31st and A streets shortly after 4 p.m. Monday.
Officer Angela Sands said the crowd scattered when police arrived. But three hours later, police got called to a second fight near 14th and Adams streets involving the same group of young people in their teens and 20s.
She said someone sprayed pepper spray during the fight, and one person was taken to the hospital for a scraped knee.
Sands said no one has been cited yet in connection with either fight, but officers are reviewing cell-phone video and surveillance footage from both locations.
Lincoln police are asking anyone with information to call them at 402-441-6000 or Lincoln Crimestoppers at 402-475-3600.