CAMP PENDLETON, Calif. -- A 17-mile stretch of the I-5 freeway in Southern California was shut down Saturday because of a demonstration involving live ammunition in celebration of the U.S. Marine Corps 250th anniversary at Camp Pendleton.

The freeway has since reopened Saturday afternoon. The closure impacted both sides of the freeway from Harbor Drive in Oceanside to Basilone Road near San Onofre.

Just minutes after the closure took effect at 11 a.m., the freeway began backing up with heavy traffic.

In a statement, the CHP said the military event will involve "live ammunition being discharged by the federal government over the freeway."

Video provided by California officials shows live munitions being fired near the freeway Friday in an apparent practice run.

Outrage grew after the

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