An ambulance company based in El Cajon said it will continue to operate despite a federal raid on its headquarters Tuesday.

Agents with the Federal Bureau of Investigation and U.S. Department of Health and Human Services served a search warrant at the headquarters of Balboa Ambulance, Inc around 6:30 a.m.

Video shot by a news helicopter showed agents on the property collecting items from the business at 1138 Broadway in El Cajon.

FBI spokesperson Darrell Foxworth said the raid is part of an ongoing criminal investigation.

An attorney for Balboa Ambulance said they have not been told the reason for the raid.

“The reason for the investigation has not been disclosed and we do not know the reason for the investigation,” said Joseph LaMagna. “We have no reason to believe that this is related to any prior investigation on immigration issues at Balboa.”

Balboa Ambulance serves all of Southern California including San Diego and Imperial Counties.

The company's website said it provides critical care, wheelchair and long distance transport to more than 100 skilled nursing facilities and acute care hospitals.

Court documents show the business has been sued 75 times in civil court here in San Diego County from 1992 – 2011.

The company under owner John Olsen has an annual revenue of $2.5 to $5 million and employs a staff of approximately 50 to 99.

It has been accredited with the Better Business Bureau since August 31, 2013.

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