Atwater police arrested a man allegedly pointing a gun at another person and firing it on Thursday.
Officers found Cruz Villegas, 19, of Atwater running on Fruitland Avenue, away from the 2700 block of Winton Way, police said. A caller reported seeing a man fitting his description firing the weapon in the area of a fight on Winton Way.
Officers placed Atwater High School on lockdown during the pursuit of Villegas at just after 3 p.m.
Police did not find the firearm, and Villegas was arrested for providing false information to police, according to officers. He was also wanted on a warrant and held without bail, police said.
The lockdown has since been lifted.