Boulder, Colorado mass shooting suspect known to FBI: report

The suspected gunman who killed 10 people in a mass shooting at a Boulder, Colo., grocery store this week was previously known to the FBI, according to a report.

Ahmad Al Aliwi Alissa, a 21-year-old from the Denver suburb of Arvada, was linked to another individual under investigation by the bureau, The New York Times reported Tuesday, citing law enforcement officials. No further details were reported.

Boulder police identified Alissa as the shooting suspect earlier Tuesday. He has been charged with 10 counts of first-degree murder and booked into the Boulder County Jail.

Alissa had bought an AR-15-style rifle on March 16, six days before 10 people, including a police officer, were gunned down Monday at a King Soopers grocery in Boulder, according to an arrest affidavit. It was not immediately known where the suspect purchased the weapon.

One of the victims was veteran Boulder Police Officer Eric Talley. The others 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.

After the shooting, a woman who identified herself as the sister-in-law of Alissa, 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 affidavit said.

Investigators have not established a motive for the attack, said Boulder County District Attorney Michael Dougherty.