A search of the suspect’s suburban Denver home turned up other weapons, a senior law enforcement source said Tuesday. The weapon used in the attack was an AR-15-style pistol modified with an arm brace, according to the source.

Authorities believe Alissa was the only person involved and that there was no additional threat to the community.

The shooter has been charged with 10 counts of first-degree murder and one charge of attempted murder, according to his arrest warrant.

The warrant described Alissa as being armed with either an assault rifle or “black AR-15” and wearing a “tactical” or “armored” vest.

The Boulder Police Department released the booking photograph of suspected gunman Ahmad Al Aliwi Alissa.

The suspect had “removed all of his clothing and was dressed only in shorts” when he was taken into custody, the affidavit said. Outside the store, the document said, Alissa wouldn’t tell police if there were other suspects.

Using law enforcement databases, the affidavit said, investigators determined Alissa had purchased a Ruger AR556 pistol on March 16.

Michael Dougherty, Boulder County District Attorney, said Alissa is a resident of Arvada, Colorado, who has “lived most of his life in the United States.”

Brother says he believes suspect was ‘paranoid’

Ahmad Al Aliwi Alissa was taken into custody after the mass shooting.

Alissa, whose family emigrated from Syria, may have been suffering from mental illness, according to his 34-year-old brother, Ali Aliwi Alissa.

The brother told CNN Tuesday that in high school bullies made fun of Alissa’s name and for being Muslim and that may have contributed to him becoming “anti-social.”

Alissa had become increasingly “paranoid” around 2014, believing he was being followed and chased, according to his brother. At one point, the young man covered the camera on his computer with duct tape so he could not be seen, said the brother, who lives with Alissa.

“He always suspected someone was behind him, someone was chasing him,” Ali Alissa said.

“We kept a close eye on him when he was in high school. He would say, ‘Someone is chasing me, someone is investigating me.’ And we’re like, ‘Come on man. There’s nothing.’ … He was just closing into himself,” the brother added.

Here is what we know about the mass shooting in Boulder, Colorado, that left 10 dead

Alissa was not very political or particularly religious, according to his brother, who said he never heard the young man threaten to use violence.

“The entire thing surprised me,” Ali Alissa said of the Monday’s shootings. “I never ever would have thought he would do such a thing. I never thought he would kill. I still can’t believe it. I am really sad for the lives that he wasted, and I feel sorry for all those families … We lost a brother even if he is the killer.”

Aside from a knife he used for cooking, Ali Alissa said he did not know his brother to carry a firearm or any other weapon.

According to the arrest warrant, a woman identified as the shooter’s sister-in-law “stated that (Ahmad Al Aliwi) Alissa was seen playing with a gun she thought looked like a ‘machine gun’ about 2 days ago. She did not believe the gun looked like the rifles she has seen in old Western movies. . . . Alissa had been talking about having a bullet stuck in the gun and was playing with the gun.”

The woman’s name was redacted from the document.

Ali Alissa said he doesn’t know why his brother went to King Soopers on Monday. Police interrogated him and another brother, according to Ali Alissa, who said authorities searched their home in the predawn hours on Tuesday.

“They searched every corner,” he said, “every piece of clothing.”

The family emigrated from Syria in 2002, the brother said. They lived in the Arvada area since 2014.

Facebook has shut down Facebook and Instagram accounts belonging to the suspect, a company spokesperson said Tuesday.

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Ahmad Al Aliwi Alissa, who was born on April 17, 1999, attended Arvada West High School starting in March 2015 until he graduated in May 2018, according to Jeffco Public Schools.

Alissa was sentenced to probation and community service after being found guilty of third-degree assault in 2018 for an incident that occurred in November 2017, according to the Colorado Bureau of Investigation’s database. No other details were immediately available.

The mass shooting suspect has made statements to investigators, Dougherty said.

“We’re collecting those statements now and we’ll be providing those in the weeks ahead,” Dougherty said.

Maris said the suspect was wounded in the leg during “an exchange of gunfire.”

The gunman was taken into custody about 3:30 p.m. Monday and transported to a hospital, where he was in stable condition.

He was booked into Boulder County Jail early Tuesday afternoon, according to the jail’s records.

The massacre at the King Soopers store occurred less than a week after shootings at three spas in the Atlanta area left eight people dead. In the last week in the US, there have been at least seven shootings in which at least four people were injured or killed.

The slain officer, 51-year-old Eric Talley, was the first to respond to the scene, according to Herold. Talley had joined the Boulder police force in 2010, she said.

The victims were ordinary Coloradans going about their daily lives — picking up groceries, waiting in line for a coronavirus vaccine. They ranged from 20 to 65 years old.

CNN’s Konstantin Toropin and Whitney Wild contributed to this report.

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