Police cars are seen outside a country music bar and dance hall in Thousand Oaks, west of Los Angeles, after a gunman barged into a large, crowded venue and opened fire late November 7, 2018, killing at least 11 people, U.S. police said. At least 12 people were killed.
Ventura County Sheriff's Office Capt. Garo Kuredjian said late Wednesday that it was still "a very active scene".
They survived the deadliest mass shooting in recent US history just over one year ago.
'All I wanted to do was get as many people out as possible, ' he said while wearing a bloodstained t-shirt.
An undated photo of Ventura County Sheriff Sgt. Ron Helus, who was shot and killed in a mass shooting at a Thousands Oaks, Calif., bar, November 7, 2018.
"It's a horrific scene in there", Dean said. The highway patrolman cleared the perimeter and pulled Helus out.
A police officer, described as a sheriff's sergeant, and the gunman are among the 13 confirmed to have died.
"He was totally committed", Dean said.
The gunman entered the California bar dressed in black and armed with a Glock 21.45-caliber handgun, according to the Los Angeles Times. But Dean said Long had used an extended magazine - illegal in California - during the shooting, which would enable the weapon to fire more rounds before needing to be reloaded.
"We have not found any type of assault rifle inside the location", he said.
Here's what we know of Long so far.
Dean said the shooter reportedly shot at employees and security before turning on the crowd.
CNN said people smashed windows with chairs to escape.
It was unclear how the injuries were sustained or the extent.
President Donald Trump said in a tweet Thursday morning that he was "fully briefed" on the shooting.
Ventura County Geoff Dean addresses the media about the shooting at the Borderline Bar and Grill in Thousand Oaks, Calif., Nov. 8, 2018.
It was just before 1am when Jason Coffman was told by some of his son's friends that there had been a shooting at Borderline Bar, a venue he knew his 22-year-old by Cody was at. The bar was hosting its weekly "College Country Night" when the incident was reported around 11.20 pm. About one hundred people were inside at the time of the shooting.
Witness John Hedge told ABC News he was near the front door of the California bar when the shooting began.
Some freshmen had planned an outing Wednesday to the bar, said Madeleine Carr, news editor at the Pepperdine Graphic, the student newspaper. "He gave his all and tonight, as I told his wife, he died a hero because he went in to save lives, to save other people", Dean added.