A YOUTUBER's live stream video shows bodies strewn on the ground after a gunman in tactical body armor massacred ten people at a supermarket.
Gunshots can also be heard in the harrowing footage filmed by a shopper as the maniac rampaged through the aisles with an AR-15-style rifle in Boulder, Colorado.
A hero dad-of-seven cop was among those killed in the at 2.30pm yesterday
Citizen journalist Dean Schiller said he was loading shopping into his car when he heard shots and pulled out his phone.
He filmed himself approaching the store saying: "I'm at King Soopers in South Boulder. I heard gunshots. They were very close. Someone's down, right here."
His video showed a person slumped apparently dead on a ramp outside the entrance, and another face down in the parking lot.
“We don’t know if there’s a shooter, active shooter somewhere,” he says in the video.
Dean asks two men who appear to work at the store if the gunman was inside.
“Yeah, he went in there. He went right down there,” one man responds.
A third victim is seen lying motionless inside the store, slumped against a display stand.
“Oh, my God. Guys, we got people down inside Kings Soopers,” Dean goes before he is cut off by the sound of loud gunshots.
"God dammit! I'm f***ing getting away guys."
He starts running and calls to a passerby who is checking on one of the victims: "There's a shooter, active shooter! Get away!"
Witnesses said a man in full tactical gear was silent as he opened fire in the parking lot before moving inside where the shooting continued.
, 51, was one of the first on the scene and was gunned down as he raced to tackle the killer minutes after the rampage began at 2.30pm.
Emergency radio traffic obtained by the revealed the frantic initial moments as cops arrived.
"Shooter is inside!" one officer called out from inside the store after walking past bodies on the ground. "He just shot at us twice."
A few seconds later someone says over the radio: "Officer down inside the building."
Later as SWAT teams swarmed on the supermarket, another officer said over the radio: “Due to body armor, head shots only.”
Soon after, a shirtless man with a beard was escorted from the scene with his hands cuffed behind his back.
He had blood running down his right leg and was limping.
The Boulder Police Department confirmed nine other people died at the King Soopers grocery store on Table Mesa Drive.
Rikki Olds, 25, was named as one of the victims in online posts by her family.
“We lost our beloved Rikki Olds to the monster who shot up the king soopers in Boulder CO yesterday may his rotten a** fry and burn in hell,” aunt Lori Olds wrote on Facebook.
The weapon used is believed to be an AR-15-style rifle, a senior law enforcement source .
Just a week ago, the National Rifle Association celebrated a court overturning a ban on such assault rifles and large capacity magazines.
Last night Boulder cops lined up to salute their slain colleague Officer Talley, a dad of seven who joined the force in 2010.
Police Chief Maris Herold choked back tears as she confirmed his death at an emotion news conference.
She said: "Police officers' actions were nothing short of heroic.
"My heart goes out to the victims of this incident. I'm grateful to the police officers who responded and I am so sorry for the loss of Officer Talley/
"We will be here working night and day. We have one suspect in custody.
"I want to reassure the community that they are safe and that we will do out best over the next few hours to identify the victims.
"Because I know there will be people out there waiting for an answer. We will work around the clock to get this accomplished."
District Attorney Michael Dougherty said Officer Talley's "life was cut much too short".
He added: "This is a tragedy and a nightmare for Boulder County.
"These were people going about their day, doing their shopping.
"I promise the victims and the people of the state of Colorado that we will secure justice."
Police said it was unclear what the shooter's motive was.
Television helicopter video showed tactical armoured vehicles and officers massing outside and at least three helicopters.
Officers had their guns drawn outside and some windows at the front of the store were broken.
One man told CBS4: “Heard a loud bang… thought someone dropped something. Then by the third bang everyone was running.”
TV footage showed officers helping terrified people to safety.
One witness said said his relatives in the store were evacuated through the roof.
He said: "They hid, ran upstairs, were hiding in a coat closet for the last hour.
"Half a dozen cops came in through the roof and got them and then told them, you know, 'Stay quiet.'"
An ambulance pulled away from the store, apparently carrying the bleeding man brought out of the store in handcuffs.
The Boulder Police Department confirmed about 6.45pm mountain time that the shelter in place order in the area had been lifted.
'HEART IS BREAKING'
King Soopers owner Kroger said it is "horrified and deeply saddened by the senseless violence" at the store.
It said: "The entire Kroger family offers our thoughts, prayers and support to our associates, customers, and the first responders who so bravely responded to this tragic situation."
Colorado Governor Jared Polis said: "My heart is breaking as we watch this unspeakable event unfold in our Boulder community.
"We are making every public safety resource available to assist the Boulder County Sheriff's Department as they work to secure the store.
"I'm incredibly grateful to the brave men and women who have responded to the scene to help the victims of this senseless tragedy."
Boulder Mayor Sam Weaver said: "Words can do no justice to the tragedy that has unfolded this afternoon.
"Our community will soon grieve our losses, and begin our healing. Our brave police officers and first responders have the gratitude of our entire city."
White House Press Secretary Jen Psaki confirmed that had been briefed on the unfolding events in Colorado.
"The President has been briefed on the shooting in Colorado and he will be kept up to date by his team as there are additional developments," she tweeted.
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Former congresswoman Gabby Giffords also released a statement saying: "This is an especially personal tragedy for me.
"I survived a shooting at a grocery store, in a tragedy that devastated my beloved community of Tucson.
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"It's been ten years, and countless American communities have had to face something similar. This is not normal, and it doesn't have to be this way. It's beyond time for our leaders to take action."