Thousand Oaks, California, where 12 people were gunned down, is ranked 3rd safest city in U.S.

Thousand Oaks, Calif., where 12 people were gunned down at a nightclub Wednesday evening, is considered one of the safest cities in the United States.

The sprawling suburb, with a population of around 128,000 and a very low crime rate, is nestled 40 kilometres west of Los Angeles, in the foothills of Santa Monica Mountains.

It was named the third-safest city in the U.S. in 2018 by the website Niche, and residents say violent crime is so rare that police don’t have much to do other than give speeding tickets.

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“We are consistently ranked one of the highest with respect to the lowest crime rate per capita; we’re proud of that,” Thousand Oaks mayor Andy Fox told CNN.

But the perception of a safe city changed Wednesday evening when 28-year-old Ian Long walked inside the Borderline Bar and Grill, a popular venue with college students in the suburb area, and opened fire in the nightclub packed with hundreds of people.

Twelve victims and the shooter died. One of the victims was Sheriff’s Sergeant Ron Helus, a 29-year veteran of the department who was one of the first officers to arrive on scene and was shot multiple times.

WATCH: Man saves dozens by throwing a bar stool through window during California shooting

1:53 California bar shooting: Man saves dozens by throwing a bar stool through window

The shooter was armed with a Glock 21 .45-caliber handgun with an extended magazine that he purchased legally, police said. Witnesses also said he threw a smoke grenade before opening fire.

Erika Sigman, 19, told the Los Angeles Times she began to race toward an exit as soon as screams erupted.

“I’m a Thousand Oaks resident,” she said. “This is a safe place. My parents let me go here. This is a trusted place. … To know that this happened in my safe place is a very, very scary thing.”

READ MORE: Witnesses describe California shooting that killed 12 as ‘huge panic’ with ‘blood everywhere’

Wednesday nights are college-themed nights open to students as young as 18, according to the bar’s website.

“I’ve learned it doesn’t matter what community you’re in,” Ventura County Sheriff Geoff Dean told reporters when asked if he was surprised this happened in Thousand Oaks. “It doesn’t matter how safe your community is. It can happen anywhere.”

0:25 California bar shooting: Sgt. Ron Helus ‘died in the line of duty as a true hero’

• California bar shooting: Sgt. Ron Helus ‘died in the line of duty as a true hero’
• California bar shooting: ‘We believe he shot himself’ says sheriff
• California bar shooting: Sheriff says Sgt. Ron Helus ‘made the ultimate sacrifice’
• California bar shooting: Police cannot provide motive, say shooter purchased gun legally, was veteran
• Police identify California bar shooter as Ian David Long, say deputies called to his house last April
• California bar shooting: Gunshots heard, people flee, injured treated

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Thousand Oaks’ mayor told CNN that in this day and age, mass shootings like this can strike anywhere.

“The reality is that these types of incidents can happen really at any place, at any time, even in communities that are considered extremely safe,” he said.

Thousand Oaks residents took to Twitter after the shooting, many saying their sense of safety in the city has now shifted.

Earlier this year, a rash of school shootings, in Parkland, Florida; Marshall County, Kentucky; and Santa Fe, Texas, sparked a wave of activism around gun-control laws.

Parkland was also rated one of the safest cities in the U.S. before a gunman killed 17 students at Marjory Stoneman Douglas High School in February.