Suspect in Colorado shooting bought assault rifle just six days before the attack.
BOULDER, Colo. — The suspect accused of opening fire inside a crowded Colorado supermarket was a 21yearold man who purchased an assault weapon less than a week earlier, authorities said Tuesday, a day after the attack that killed 10 people, including a police officer.
Ahmad Al Aliwi Alissa bought the weapon on March 16, just six days before the attack at a King Soopers store in Boulder, according to an arrest affidavit. It was not immediately known where the gun was purchased.
Alissa, who is from the Denver suburb of Arvada, was booked into the county jail Tuesday on murder charges after being treated at a hospital. He was due to make a first court appearance Thursday.
Investigators have not established a motive, but they believe Alissa was the only shooter, Boulder County District Attorney Michael Dougherty said.
A law enforcement official briefed on the shooting said the suspect’s family told investigators they believed Alissa was suffering some type of mental illness, including delusions. Relatives described times when Alissa told them people were following or chasing him, which they said may have contributed to the violence, the official said. The official was not authorized to speak publicly and spoke on condition of anonymity.
The attack was the nation’s deadliest mass shooting since a 2019 assault on a Walmart in El Paso, Texas, where a gunman killed 22 people in a rampage that police said targeted Mexicans.
In Washington, President Biden called on Congress to tighten the nation’s gun laws.
“Ten lives have been lost, and more families have been shattered by gun violence in the state of Colorado,” Biden said at the White House.
The shooting came 10 days after a judge blocked a ban on assault rifles passed by the city of Boulder in 2018.
A lawsuit challenging the bans was filed quickly, backed by the National Rifle Association. The judge struck down the ordinance under a Colorado law that blocks cities from making their own rules about guns.
Supermarket employees told investigators that Alissa shot a man multiple times outside the Boulder grocery store before going inside, according to the affidavit. Another person was found shot in a vehicle next to a car registered to the suspect’s brother.
By the time he was in custody, Alissa had been struck by a bullet that passed through his leg, the affidavit said. He had removed most of his clothing and was dressed only in shorts. Inside the store, he had left the gun, a tactical vest, a semiautomatic handgun and his bloodied clothing, the affidavit said.
When he was a high school senior in 2018, Alissa was found guilty of assaulting a fellow student in class after knocking him to the floor, then climbing on top of him and punching him in the head several times, according to a police affidavit.