Armed with a Glock .45, the man was wearing all black and first shot the bouncer and a young female cashier before throwing smoke grenades onto the dance floor and firing into the crowd of dancers.
Dozens of people panicked and used stools to break out windows to escape.
When the first police officers arrived at the scene three minutes after the first shot, the gunman attacked them before shooting himself.
By the time California SWAT teams arrived, the suspect was dead. Sheriff’s sergeant Ron Helus, a 29-year veteran who was planning to retire today, was the first to enter the carnage and died from his wounds later at the hospital.
Somewhere between “10 to 15” were among the injured.
The gunman was dressed in all-black, wearing a baseball cap, sunglasses and a bandanna-type mask covering the bottom of his face.
The bar is popular with college and high school kids because it allows people under 21 on Wednesday nights.
Pepperdine University confirmed this morning that some of their students were present.
“The University has determined that multiple Pepperdine students were on site at Borderline Bar and Grill in Thousand Oaks. At this time, the University is working to identify and provide support to those students.
“Pepperdine officials are working with authorities and will provide updates as more information is available. The University offers its deepest condolences and is praying for everyone involved in tonight’s tragic events,” the school said, cancelling some of its classes today.
People hid from the shooter in bathrooms and attic spaces, while others escaped and went for help.
Witnesses reported that the gunman said “nothing” and was cool and calculated during the attack.
“I was just dancing normally and I heard what I thought was a balloon pop. I was confused then I heard it a couple more times then I turned around and I saw him.
“’I ran to the nearest exit and tripped and fell on the way I knocked on as many doors as I could until someone would answer me and finally someone did. It was awful,” Taylor Von Molt told reporters.
“He had a black mask, it looked like a bandanna, on the bottom of his face, sunglasses dark hoodie, dark jeans. He was kind of bigger, more burly. Scary,” the 21-year-old, club promoter said.
Another witness recounted, “I saw three people get shot by him. As soon as he walked in, he had perfect form. I’m born in a military family and I’ve been around guns my entire life so I know a bit about them.
“He looked like he knew what he was doing. He had practiced, he had been shooting before,” she told Fox News, adding, “College students go there, high school seniors go there, elderly people go there. Everyone who loves country goes there.”
Several people are still unaccounted for and worried parents are searching for them.
“It’s a horrific scene in there, there is blood everywhere and the suspect is part of that, and I didn’t want to get that close and disturb the scene and possibly disturb the investigation,” Ventura County Sheriff Geoff Dean said afterwards, adding, “This, by far, is the most horrific thing I’ve seen in my 41 years.”
“He didn’t say anything at all. He just started shooting,” one witness reported.
Many people are sick over this tragedy and wonder what could have led to it.