Who Is Ahmad Alissa? 21-Year-Old Suspect in Boulder Shooting Is Stable After Sustaining Injury

Colorado authorities released the identity of the alleged Boulder supermarket shooter on Tuesday morning. Ahmad Al Aliwi Alissa, 21, is accused of opening fire and killing 10 people during the Monday massacre.

Boulder Police named the Arvada, Colorado, resident as the injured suspect seen in video following the deadly mass shooting Monday at a King Soopers supermarket. The man allegedly opened fire on customers and killed a Boulder police officer, 51-year-old Eric Talley, during the shooting. The deceased victims range in age from 20 years old to 65 years old. A law enforcement press release identified his full name as Ahmad Al Aliwi Alissa. A Facebook page appearing to be that of the suspect features posts with quotes from the Islamic Prophet Muhammad.

Speaking with the Daily Beast Tuesday, the suspect's brother said his sibling had for years claimed imaginary people were following him wherever he went. Described as "quiet" by numerous family members, Alissa was also characterized as deeply paranoid.

Alissa was shot during an exchange of gunfire with responding officers and was transported to a local hospital where he was put in stable condition. "The man who gunned them down will be held fully responsible," said Boulder District Attorney Michael Dougherty during a Tuesday press conference update on the shooting. When asked if the shooter had expressed a motive to police, he replied, "We don't have the answer for that yet."

🚨🚨Breaking: Boulder mass-shooting suspect identified as Ahmad Alyssa, 21, of Arvada. Suspect was shot in firefight with police, taken into custody, and transported to the hospital. pic.twitter.com/lw3tysVVmC

— CIA-Simulation Warlord 🇺🇸🦈🇺🇸 (@zerosum24) March 23, 2021

The attack lasted around 20 minutes Monday around 3 p.m. local time. Video and photographs from the scene showed several bodies laying across the grocery store floor. He will soon be transported to Boulder County jail to await court proceedings. Alissa stands charged with 10 counts of murder in the first degree. In a report published Tuesday by Daily Beast, Alissa's 34-year-old brother said authorities searched his home for hours Monday night following the shooting. His brother described the alleged shooter as "very anti-social" and exhibiting behavior consistent with mental illness.

Court documents obtained by NBC News show the suspect was born in April 1999.

This story is developing, please check back with Newsweek for additional information.

ahmad alissa boulder shooter suspect
Healthcare workers walk out of a King Sooper's Grocery store after a gunman opened fire on March 22, 2021 in Boulder, Colorado. Dozens of police responded to the afternoon shooting in which at least one witness described three people who appeared to be wounded, according to published reports. CHET STRANGE / Stringer/Getty Images