San Diego Gas & Electric crews stumbled upon an ordnance while doing work in Tierrasanta Monday afternoon.
The employees found the 3-inch mortar shell as they worked in a canyon next to an electrical substation near Tierrasanta Boulevard and Colina Dorada Drive, according to San Diego police.
SDG&E immediately called police, who requested San Diego Fire-Rescue teams.
A bomb squad investigated the scene and cleared it.
No evacuations have been ordered, and no injuries have been reported.
