Los Angeles (CNN) Investigators have not determined the cause of the fire aboard the California dive boat that sank last week, a law enforcement official familiar with the investigation said, noting the boat has not even been brought to the surface.

The Conception sank off the Southern California coast on Labor Day following a fire that claimed the lives of 34 passengers.

The official noted that any reporting about the cause would be speculative. Weather conditions have prevented efforts to surface the boat.

The official said authorities are reviewing records obtained during the execution of search warrants in order to determine the Conception's safety record and practices of the operating company.

The Coast Guard Investigative Service on Sunday and Monday served search warrants on Truth Aquatics, the owner of the diving boat that was swallowed up by flames , Santa Barbara County Sheriff's Office spokesman Lt. Eric Raney told CNN on Sunday.

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