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Spilled oil along the Santa Barbara coastline. Image courtesy of Mile Eliason/Santa Barbara County Fire Department.

A California pipeline operated by Plains All American spilled 21,000 gallons of crude along the Santa Barbara coastline Tuesday, creating a 4 mile long oil slick in the Pacific Ocean.

The rupture was first detected by a bystander around noon and was eventually stopped by the U.S. Coast Guard around 3 p.m. Tuesday, the LA Times said.

Officials have warned that winds could push the spilled oil another four miles south towards Isla Vista.

Houston-based Plains All American has shutdown the 150,000 barrel per day pipeline and blocked a nearby culvert to prevent more oil from escaping into the ocean.

No evacuations have been ordered.

According to the Santa Barbara County Office of Emergency Management, local, state and federal officials are establishing a unified command to investigate the leak and coordinate cleanup efforts.

A spokesperson for California governor Jerry Brown told the LA Times the governor is “monitoring the situation with great concern.”