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A crazed gunman – dressed like “Rambo” and bent on “heading into war” – shot six co-workers and killed himself at a FedEx facility near Atlanta on Tuesday, police said.

Three people were listed in critical condition — a 52-year-old woman and two men, 28 and 22, officials said.

The 28- and 52-year-olds were rushed into surgery after being shot at close range, authorities said.

FedEx clerk Liza Aiken said the shooter, who she described as a 19-year-old package loader, was armed to the teeth.

“He had bullets strapped across his chest like Rambo, a huge assault rifle and he had a knife,” Aiken told reporters gathered in an employee parking lot.

Aiken said she ran for her life, immediately after spotting the shooter.

“I mean he looked like he was heading into war,” Aiken told The Atlanta Journal-Constitution. “As soon as I saw him, I ran the other way. I ran and made sure that people upstairs were gone. He was in all black. I think he had a camo vest.”

As Aiken spoke to reporters, a woman with a FedEx jacket approached the worker and ordered her to stop talk before leading her away.

After the first calls for help came at 5:54 a.m., hundreds of cops and paramedics rushed to the delivery service’s operation, at 1675 Airport Road in Kennesaw, Ga.

“We have one individual that is deceased that we are describing as the suspect,” Cobb County police Sgt. Dana Pierce said.

“He is probably deceased from a self-inflicted gunshot wound. He was located in the bay area of FedEx. We are completing the ground floor sweep at this point with the assistance of K-9.”

FedEx driver David Titus said he witnessed the gunman shoot a security guard in the midsection outside the building, before going inside to open fire.

“It was chaos,” Titus said. “Everyone was running ducking and hiding, trying to get out of there.”

The FedEx facility is in Cobb County, about 25 miles northwest of downtown Atlanta.

“[My boss] called me about 6 o’clock this morning saying there was a guy inside, shot the security guard,” driver Michael Hogland said. “He had a gun pointed at him and said, ‘Don’t worry about getting here on time.’ ”

Company officials pledged to help cops in their investigation.

“Our thoughts and prayers are with those affected, and with their families and friends,” FedEx spokesman Scott Fiedler said.

“The situation is now stabilized and we are focused on the needs of our team members and cooperating with the law enforcement investigation of this tragedy.”