The lockdown at Oakdale Elementary School has been lifted, school district officials said.
The North Highlands School was locked down around the time school let out at 3:35 p.m. after reports of shots fired near the campus,
So far, no victim has been located, said Sacramento County sheriff's Sgt. Jason Ramos. Deputies are assisting Twin Rivers police officers in the investigation.
Oakdale is located in the 3700 block of Myrtle Avenue in North Highlands.