Cause of California diving boat fire remains unknown

(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 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. Federal agents also searched the company’s boats the Vision and the Truth, officials said. “This is all just part of the ongoing investigation,” Raney said. “The Coast Guard was assisted by ATF, which is investigating the fire and the FBI, which has …