A short time later, Long was found dead of a suspected self-inflicted gunshot wound.
Some of the classmates that teased Long were at the bar the night of the shooting.
Investigators have not commented on whether mental illness played a role in the rampage.
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Soon after the shooting started, Sergeant Ron Helus, a veteran of 29 years, was first on the scene and entered the bar with another policeman.
It's not exactly clear when he posted the social media messages, but law enforcement officials said that he walked to the back of the bar after hearing the sounds of police sirens and began indiscriminately firing on patrons.
ABC Reporter Marc Brown said: "We are hearing that some of the people who were at Borderline, were also at the Route 91 Harvest Festival in Las Vegas, scene of the worst mass shooting in modern United States history". "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". "He didn't come home last night", Susan Orfanos said in tears. "It was our our home for the probably 30 or 45 of us who are all from the greater Ventura County area who were in Vegas".
A survivor of the Las Vegas shooting massacre previous year was killed in Wednesday's shooting at a popular Southern California country bar.
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Among the crowd, which was largely comprised of students celebrating "college country night", Teylor Whittler was celebrating her friend Nellie Wong's birthday.
"I want gun control". She could often hear him yelling and cursing, but several months ago unusually loud banging and shouting prompted her husband to call authorities. "He really liked it", said one woman who was friends with him for five years.
The sheriff said a mental health crisis team was called at the time and concluded Long did not need to be taken into custody. "If he talks, just acknowledge him, don't go into conversation with him, '" Don MacLeod said Thursday.
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That'll take us some number of months to do that. "America has been defeated by the Islamic Republic over the past 40 years". Jafari said, referring to the failed American mission to rescue the hostages known as Operation Eagle Claw.
University freshman Cole Knapp was talking with friends inside the Borderline Bar and Grill in the Los Angeles suburb of Thousand Oaks when he saw a man dressed in black reach towards the counter by the door as if he was paying his cover charge. The city is consistently ranked near the top of the lists of safest places in California. Add Thousand Oaks Shooting as an interest to stay up to date on the latest Thousand Oaks Shooting news, video, and analysis from ABC News.