In a news conference Thursday afternoon, law enforcement officials said the investigation was ongoing and that there were no indications the shooter was acting with others.

The FBI is continuing to process the crime scene, and there are no indications the shooter was working any associates, said FBI Assistant Director Paul Delacourt. There are no other threats to the area.

"It would be premature to speculate on the motivation," Delacourt said, adding that the FBI is still working to "paint a picture of the frame of mind of the subject."

Authorities also identified the victims, and notified their families. A list of names will not be released until later today, said Ventura County Sheriff’s Captain Garo Kuredjian.

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