Boulder gunman's sister-in-law upset he was 'playing' with gun, took it away two days before rampage, cops say

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Booking photo of the Boulder King Soopers shooting suspect, 21-year-old Ahmad Al Aliwi Alissa. Photo: Boulder Police Dept.

FOX NEWS - A family member of the Boulder, Colorado, shooting suspect told police she saw him "playing" with a gun that looked like a "machine gun" and took it away from him two days before the deadly rampage.

The woman, who identified herself as the sister-in-law of Ahmad Al Aliwi Alissa, spoke with authorities hours after he allegedly gunned down 10 people Monday afternoon at a King Soopers grocery store.

The woman said Alissa had been talking about having a bullet stuck in the gun and was playing with it, according to an arrest affidavit. She became upset that he was "playing with the gun in the house" and took the weapon away from him, police said.

MORE: Boulder King Soopers shooting: 21-year-old man to be charged with 10 counts of first-degree murder

She said the weapon didn't resemble the rifles seen in "old Western movies" but that it looked liked a "machine gun." At the time she was questioned, she said she believed the weapon was back in Alissa's room, which was located on the top level of the home in the Denver suburb of Arvada.

Authorities said Alissa purchased a Ruger AR-556 pistol on March 16, six days before Monday's shooting. The affidavit said authorities found a semi-automatic handgun, a tactical vest and jeans and shirt at the scene of the killings.

The five-page document details what witnesses told investigators – that a gunman with what was described as an AR-15 rifle shot several people inside the grocery store and a parking lot.

10 people killed, including a police officer in shooting at Colorado grocery store

Commissioner Danielle Outlaw joins Good Day Philadelphia to discuss the shooting.

One of the victims was veteran Boulder Police Officer Eric Talley. The other were identified as: Denny Stong, 20; Neven Stanisic, 23; Rikki Olds, 25; Tralona Bartkowiak, 49; Suzanne Fountain, 59; Teri Leiker, 51; Kevin Mahoney, 61; Lynn Murray, 62, and Jody Waters, 65.

Witnesses said Alissa appeared to be wearing body armor and tactical gear before he surrendered to SWAT officers. He is charged with 10 first-degree murder counts and one count of attempted first-degree murder.