Small plane makes emergency landing on San Diego freeway

A small plane safely landed on Interstate 15 in San Diego Monday afternoon during the evening rush hour commute. 

What we know:

The aircraft touched down on the center divider near the Balboa Avenue exit just before 5 p.m. and caused significant traffic delays. 

Fortunately, no one on board or on the ground was injured.

What we don't know:

The cause of the emergency landing is under investigation.

 Additionally, it is not specified how many people were on board the plane. 

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