The police officer who was shot and killed was identified as Sheriff's Sgt. Ron Helus, who was labelled a "hero" for attempting to stop the incident.
The president of California State University, Northridge, saidin a statement that Long was a former student at the school, most recently in 2016.
"We can confirm that there are several people that have been injured inside the bar and grill, including one deputy sheriff that was transported" to a local hospital, he said.
The sheriff said the gunman has not been identified and there was no known motive for the shooting.
Authorities say they don't know if there is a terrorism link to the shooting.
The bar was holding its regular "College Country Nights" on Wednesday night when the gunman dressed in black opened fire inside the bar.
When deputies arrived at the scene three minutes after the first 911 call, shots were still being fired, Dean said.
"Before it happened it was just a normal Wednesday night, just having a good time and as soon as it all started, it just went to utter chaos real quick", Cole Knapp said. "The security guard...was down".
Long served in the Marines from August 2008 until March 2013.
Here's what we know about the victims of the attack.
Dean said police had previous run-ins with Long, including a call to his home where he was acting irrationally. Although the cops called in a mental health specialist to assess Ian, they ultimately decided not to have him committed involuntarily.
Sheriff Dean added Long obtained the murder weapon - a Glock 21.45 calibre handgun - legally, but the weapon had an illegal magazine extension. "We believe he shot himself".
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