SAN DIEGO (CNS) - At least one man was injured Sunday afternoon during an explosion at a storage unit in Santee.
   
Around 12:15 p.m. firefighters and sheriff's deputies were on the scene at the unit in the 10100 block of Mission Gorge Road, according to Heartland 
Fire and Rescue.
   
At least one man was injured during the explosion and suffered burns to his back, according to Heartland Fire and Rescue.
   
It was not immediately made clear what had ignited or exploded.