Four killed as small planes collide in California

California: Four people were killed Sunday when a pair of small aircraft collided in southern California near the Mexican border, US media reported.

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.

The crash killed four and caused small brush fires, according to the San Diego Union-Tribune.

No cause for the crash was known but aviation authorities were investigating.