The California Highway Patrol shut down a portion of State Route 163 near Friars Road due to police activity.
As of 3:40 p.m., police cleared their scene and opened the roadway.
The closure of the large freeway snarled traffic on the Saturday afternoon. Both the northbound and southbound directions were closed for a period of time.
A call came in around 12:30 p.m. Saturday reporting three to five military-type ordinances in the center divide, the CHP said.
When a CHP unit went out, they could not initially tell what the objects were, so they took extra precautions and shut down the freeway and called out a bomb squad.
Camp Pendleton and Miramar officials were called as well to see if something may have been dropped in transport. Caltrans said on scene what they found "appeared to be replicas."