Police gathered at a home near the Signal Hill-Long Beach border where a body could be seen on a porch Saturday night, but authorities declined to provide any immediate information about the situation.
The Signal Hill Police Department had California Avenue shut down between Wardlow Road and 33rd Street as of 6 p.m.
Dave Brooks, who lives nearby, said he heard a single gunshot.
Officers on the scene said the department would not be making any statement Saturday, but confirmed it was not a police shooting.