LOS ANGELES — More than a half-dozen Southland law enforcement and fire department officials were among those injured in the massacre at the Route 91 Harvest Country Music Festival on the Las Vegas Strip, the worst mass shooting in U.S. history.

At least two Los Angeles County Sheriff’s Department employees, two Los Angeles Fire Department firefighters, an Orange County sheriff’s deputy, a Los Angeles police officer and two Newport Beach employees, including an off-duty police officer, and were wounded in Sunday night’s shooting. A gunman perched on the 32nd floor of the Mandalay Bay Resort and Casino unleashed hails of bullets on fans watching the festival as headliner Jason Aldean performed.

Law enforcement officials in Las Vegas said Monday morning at 58 people were killed and 515 wounded by the lone gunman, who was identified as 64-year- old Stephen Paddock of Mesquite, Nevada. An FBI official in Las Vegas said Paddock did not appear to have any connection to terrorism, despite a reported claim of responsibility by the terrorist group ISIS.

Paddock’s ex-wife lives in Cerritos, and she apparently called the Los Angeles County Sheriff’s Department after news of the shooting broke. The woman, who isn’t speaking publicly, told deputies she was married to Paddock for six years, but they’ve been divorced for more than two decades, sheriff’s officials told reporters at the scene.

One Los Angeles County sheriff’s employee was shot during the melee and was listed in critical condition Monday, while a second was displaying stable vital signs, as was an LAPD officer who was at the event, according to Southland authorities.

Our thoughts & prayers are w/ the 2 @LASDHQ off-duty personnel that were struck by gunfire & all those affected https://t.co/susPlvSloQ pic.twitter.com/xMWiBVG6e5 — Jim McDonnell (@LACoSheriff) October 2, 2017

The Los Angeles Police Department officer assigned to the Foothill Division was shot in the leg in the mass-shooting, said Officer Rosario Herrera of the LAPD’s Media Relations Section, adding that the officer was the only LAPD officer wounded in the massacre.

“While this appears to be an isolated incident with no apparent threat to Los Angeles, we ask the public to stay vigilant and aware of your surroundings,” according to the LAPD.

Our thought/prayers are with those affected by the Las Vegas mass shooting. One #LAPD off duty ofcr shot & expected to recover #PrayForVegas pic.twitter.com/lUbEMNjm11 — LAPD HQ (@LAPDHQ) October 2, 2017

At least seven off-duty LAFD employees were at the concert, and two of them were wounded, said LAFD Chief Ralph Terrazas.

“Thankfully, their wounds do not appear to be life-threatening,” Terrazas said in a statement. “Our thoughts and prayers are with them and their families and all of the people affected by this horrific and senseless tragedy.”

The Orange County Sheriff’s Department confirmed one of its deputies was wounded at the concert and that a couple of family members had been wounded.

The Association of Orange County Deputy Sheriffs said in an email, “At this time, we are aware of one AOCDS member who was wounded, sustaining gunshot wounds to the abdomen and thigh. The injuries are severe but non-life-threatening at this time. Two AOCDS member’s wives also sustained non-life-threatening gunshot wounds in the attack.”

#OCSDPIO:1 Deputy and multiple family members of other dept. personnel injured by gunfire in LV shooting. All non-life threatening injuries — OC Sheriff, CA (@OCSD) October 2, 2017

“Many (Association of Orange County Deputy Sheriffs) members and their families attended the concert and were present when the attack occurred,” according to an email.

At least six off-duty Orange County Fire Authority firefighters were at the concert with family members or friends, said OCFA Capt. Steve Concialdi.

“We are pleased to report that all are OK,” Concialdi said.

The two Newport Beach employees were hurt but are expected to survive, said Jennifer Manzella of the Newport Beach Police Department.

In Riverside County, a county sheriff’s department employee was also injured.

With initial reports of multiple shooters in numerous locations in Las Vegas, Los Angeles County Sheriff Jim McDonnell activated the Department Operations Center shortly after the shooting was reported and readied a response team that included SWAT teams and a bomb squad, the Sheriff’s Information Bureau reported.

Additionally, a Super Puma helicopter was prepared for deployment, but the crew stood down after the Las Vegas Metro SWAT team determined that a single shooter was involved. Authorities said Paddock killed himself.

As is usually the case, Las Vegas was teeming with Southland residents Sunday night. A Long Beach resident who attended the festival described how he helped carry an unconscious woman to out of the line of fire.

Al Quackenbush told City News Service that singer Jason Aldean was performing at the open-air festival when the gunfire rang out, causing a massive scramble for survival.

“(We) carried a girl who was shot,” said Quackenbush, describing the victim as a woman in her 20s. “We carried her behind a concrete pillar with her friends, then we got out of there. We are safe.

“We heard many shots,” Quackenbush said. “Like 300-plus shots. I figure it was an automatic rifle. We were right there.”

Orange County resident David Wolfe told a reporter his wife and daughter were at the concert.

Wolfe said he was “in absolute panic; scared to death until my wife called and said they were OK.”

Brianna Taylor of Orange County told NBC4 that she and her fiance were near the front of the stage close to Aldean when the bullets began to rain.

The shaken Taylor said she first thought it was fireworks, but “seconds later, we found it was a lot more serious that,” as she saw two people within 10 feet of her get shot.

“We just stayed as low as we could for awhile,” Taylor said. “(But) as soon as they said they needed medics, we knew we were sitting ducks.

“I said `Babe, this can’t be how we die, this can’t be how we go.’ So we just got up and ran behind the stage and got out,” eventually hiding with about 200 other people in a helicopter rental company.

“Instinctively, when you get a chance to run for your life, you run for your life,” Taylor said.

Orange County Register staff writer Alma Fausto contributed to this report.