Reporters with the student paper Pepperdine Graphic of Pepperdine University in Malibu shared harrowing footage and interviews with victims and witnesses outside the Borderline Bar & Grill in Thousand Oaks early Thursday, where authorities said 13 people died, including the shooter.
Police say at least 10 people are known to have been injured and others are self-reporting with injuries at local hospitals.
Long's body was found inside an office adjacent to the bar's entrance.
"Ron was a hardworking, dedicated sheriff's sergeant who was totally committed", Dean said, choking back a few tears and clearing his throat.
Mr Dean said his department had several previous contacts with the former Marine including a call to his home in April, when deputies found him acting in an irate and irrational manner.
"I screamed to him, 'There's a shooter in there!' He was kind of in disbelief, then saw that I was serious", Knapp said.
According to the Pentagon, Long served in the Marine Corps from August 2008 to March 2013 and was a machine gunner. It's unclear whether the magazine was legally purchased. "It's affecting the way I view relationships, because I'm afraid when it comes to the safety and well-being of everyone that I love".
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Helus was immediately hit with multiple gunshots, Dean said.
"It appears he walked up to the scene". I looked up and he was moving to the right.
"There's no doubt that they saved lives by going in there and engaging with the suspect", said Dean, who was set to retire on Friday.
Authorities are working to identify the victims and inform their families.
Federal Bureau of Investigation officials were seen visiting a residence believed to be Long's in Newbury Park, California, which neighbors Thousand Oaks.
He died at a hospital.
Ventura County Sherriff Geoff Dean called the attack "horrific". "You're always overanalyzing people, trying to figure out if something were to go down, 'What would I do?'"
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"We lost a hero", he said.
Victims were forced to hide in bathrooms and attic crawlspaces as the shooting unfolded, while armed cops descended on the scene.
"I was actually about to leave when you start hearing pop, pop, pop".
The Borderline, which includes a large dance hall along with several smaller areas for eating and drinking, was holding one of its regular "College Country Nights".
'All I did was grab as many people as I could and pull them underneath the table until I heard a break in the shots, and then we got people out of there, as much as we could, ' he added.
It was the latest mass shooting to rock the United States, six days after the death of two women at a yoga class in Tallahassee, Florida and 12 days after an anti-Semitic gunman entered a synagogue in Pittsburgh and killed 11 worshippers.
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