People who survived the shooting at the Route 91 Harvest country music festival in Las Vegas in October 2017 were reportedly at the shooting in Thousand Oaks, California, on Wednesday night.

The shooting at the Borderline Bar & Grill, 45 miles northwest of Los Angeles, left at least 13 people dead, including the gunman and a police officer. It ties for the 15th-deadliest shooting in modern US history.

The Las Vegas shooting, the deadliest in modern US history, targeted the same crowd in the same region.

People who survived the deadliest shooting in modern US history, at the Route 91 Harvest country music festival in Las Vegas in October 2017, were reportedly at a shooting late Wednesday at a college bar in Thousand Oaks, California.

The shooting at the Borderline Bar & Grill, about 45 miles northwest of Los Angeles, left at least 13 people dead, including the gunman and a police officer. It is tied for the 15th-deadliest shooting in modern US history.

"It's the second time in about a year and a month that this has happened," Nicholas Champion, who was at the bar, told ABC News, adding: "It's a big thing for us. We all are a big family, and unfortunately this family got hit twice."

More than 100 people were at the bar when shots rang out, and Champion said that 50 or 60 had survived the shooting in Las Vegas.

"A lot of people in the Route 91 situation go here," Chandler Gunn, 23, of Newbury Park, California, told the Los Angeles Times of the Borderline Bar & Grill.

He said the bar holds a college country night on Wednesdays with line dancing and country music, similar to the theme of the festival in Las Vegas, where last year a shooter with an arsenal of more than 20 rifles opened fire from his 32nd-floor hotel room on the crowd below.

"There's people that live a whole lifetime without seeing this, and then there's people that have seen it twice," Gunn told the Times.

Read more: What happened at the Thousand Oaks shooting

Witnesses who spoke with KABC, a local TV news station, also said that survivors of the Las Vegas shooting were at the bar during the shooting in Thousand Oaks and that it was usually packed with nearby students on a Wednesday night.

Savannah Stafseth, who was outside on the porch when the shooting started, told the Times that the bar was "insanely crowded."

"There are no words. Those are my people. It's just not fair. It's not fair," Stafseth told the Times. "All these people after Route 91. It's not fair."

As of 8 a.m. ET on Thursday, the victims of the Thousand Oaks shooting had not been identified. Friends and family members of the bar-goers had gathered nearby awaiting word from their loved ones.