PHOTO: BREAKINGNEWS.IE
One of the aircraft was a twin-engine Sabreliner and the other a single-engine Cessna 172.
They crashed near Brown Field Airport in San Diego, the Los Angeles Times reported.
Read: Airline to weigh passengers before boarding to ensure 'safety'
The crash killed four and caused small brush fires, according to the San Diego Union-Tribune.
Read: Rescue teams race to Indonesian plane crash site
No cause for the crash was known but aviation authorities were investigating.
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