There was a fire, authorities said, which has been put out.
The Federal Aviation Administration (FAA) and the National Transportation Safety Board (NTSB) have been notified, and will handle the plane crash investigation, the Sheriff’s Department said.
“We are just helping with the initial response and road closures” the Sheriff’s Department said in an email to CNN.
El Cajon is about 16 miles east of San Diego.
CNN has reached out to the El Cajon Police, the FAA and NTSB to learn more.
This is a developing story and will be updated.