A 22-year-old gunman opened fire with a semiautomatic rifle inside a gay nightclub in Colorado Springs, killing five people and leaving 25 injured before he was subdued by “heroic” patrons and arrested by police who arrived within minutes, authorities said Sunday.

The suspect in the Saturday night shooting at Club Q used an AR-15-style semiautomatic weapon, a law enforcement official said. A handgun and additional ammunition magazines also were recovered, according to the official, who could not discuss details of the investigation publicly and spoke to The Associated Press on condition of anonymity.

The attack ended when a patron grabbed a handgun from the suspect and hit him with it, Colorado Springs Mayor John Suthers told The Associated Press. The person who hit the gunman had him pinned down when police arrived, Suthers said.

“Had that individual not intervened this could have been exponentially more tragic,” Suthers said.

On its Facebook page, the club called it a “hate attack.” Investigators were still determining a motive and whether to prosecute it as a hate crime, said El Paso County District Attorney Michael Allen. Charges against the suspect will likely include first-degree murder, he said.

Police identified the alleged gunman as Anderson Lee Aldrich, who was in custody and being treated for injuries.

Aldrich was arrested in 2021 after his mother reported he threatened her with a homemade bomb and other weapons, authorities said. They declined to elaborate on that arrest. No explosives were found, authorities said at the time, and The Gazette in Colorado Springs reported that prosecutors did not pursue any charges and that records were sealed.

Of the 25 injured, at least seven were in critical condition, authorities said. Some were hurt trying to flee, and it was unclear if all of the victims were shot, a police spokesperson said.

Suthers said there was “reason to hope” that all of those hospitalized would recover.

The shooting rekindled memories of the 2016 massacre at the Pulse gay nightclub in Orlando, Florida, that killed 49 people. Colorado has experienced several mass killings, including at Columbine High School in 1999, a movie theater in suburban Denver in 2012 and at a Boulder supermarket last year.

It was the sixth mass killing this month and came in a year when the nation was shaken by the deaths of 21 in a school shooting in Uvalde, Texas.

Authorities were called to Club Q at 11:57 p.m. Saturday with a report of a shooting, and the first officer arrived at midnight.

Joshua Thurman said he was in the club with about two dozen other people and was dancing when the shots began. He initially thought it was part of the music, until he heard another shot and said he saw the flash of a gun muzzle.

Thurman, 34, said he ran with another person to a dressing room where someone already was hiding. They locked the door, turned off the lights and got on the floor but could hear the violence unfolding, including the gunman getting beaten up, he added.

“I could have lost my life — over what? What was the purpose?” he said as tears ran down his cheeks. “We were just enjoying ourselves. We weren’t out harming anyone. We were in our space, our community, our home, enjoying ourselves like everybody else does.”

Detectives also were examining whether anyone had helped Aldrich before the attack, Police Chief Adrian Vasquez said. He said patrons who intervened during the attack were “heroic” and owed a debt of gratitude for preventing more deaths.

Club Q is a gay and lesbian nightclub that features a drag show on Saturdays, according to its website. Club Q’s Facebook page said planned entertainment included a “punk and alternative show” preceding a birthday dance party, with a Sunday all-ages drag brunch.

Suthers noted that the club had operated for 21 years and had not reported any threats before Saturday’s attack.

Drag events have become a focus of anti-LGBTQ rhetoric and protests recently as opponents, including politicians, have proposed banning children from them, falsely claiming they’re used to “groom” children.

Attorney General Merrick Garland was briefed on the shooting and the FBI was assisting police with the investigation.

To substantiate a hate-crime charge against Aldrich, prosecutors would have to prove he was motivated by the victims’ actual or perceived sexual orientation or gender identity. So far, the suspect has not been cooperative in interviews with investigators and has not given them clear insight yet about the motivation for the attack, according to the official who spoke on condition of anonymity.

President Joe Biden said that while the motive for the shootings was not yet clear, “we know that the LGBTQI+ community has been subjected to horrific hate violence in recent years.”

“Places that are supposed to be safe spaces of acceptance and celebration should never be turned into places of terror and violence,” he said. “We cannot and must not tolerate hate.”

Colorado Gov. Jared Polis, who became the first openly gay man in the United States to be elected governor in 2018, called the shooting “sickening.”

“My heart breaks for the family and friends of those lost, injured and traumatized,” Polis said. “Colorado stands with our LGTBQ community and everyone impacted by this tragedy as we mourn.”

A makeshift memorial sprang up Sunday near the club, with flowers, a stuffed animal and candles and a sign saying “Love over hate” next to a rainbow-colored heart.

Seth Stang was buying flowers for the memorial when he was told that two of the dead were his friends. The 34-year-old transgender man said it was like having “a bucket of hot water getting dumped on you. ... I’m just tired of running out of places where we can exist safely.”

Ryan Johnson, who lives near the club and was there last month, said it was one of only two nightspots for the LGBTQ community in conservative-leaning Colorado Springs. “It’s kind of the go-to for pride,” the 26-year-old said of the club, which is tucked behind other businesses, including a bowling alley and a sandwich shop.

Colorado Springs, a city of about 480,000 located 70 miles (112 kilometers) south of Denver, is home to the U.S. Air Force Academy, the U.S. Olympic Training Center, as well as Focus on the Family, a prominent evangelical Christian ministry that lobbies against LGBTQ rights. The group condemned the shooting and said it “exposes the evil and wickedness inside the human heart.”

In November 2015, three people were killed and eight wounded at a Planned Parenthood clinic in the city when authorities say a gunman targeted the clinic because it performed abortions.

“Club Q is devastated by the senseless attack on our community,” the club posted on Facebook. “We thank the quick reactions of heroic customers that subdued the gunman and ended this hate attack.”

The CEO of a national LGBTQ-rights organization, Kevin Jennings of Lambda Legal, pleaded for tighter restrictions on guns.

“America’s toxic mix of bigotry and absurdly easy access to firearms means that such events are all too common and LGBTQ+ people, BIPOC communities, the Jewish community and other vulnerable populations pay the price again and again for our political leadership’s failure to act,” he said in a statement.

The shooting came during Transgender Awareness Week and just at the start of Sunday’s International Transgender Day of Remembrance, when events around the world are held to mourn and remember transgender people lost to violence.

In June, 31 members of the neo-Nazi group Patriot Front were arrested in Coeur d’Alene, Idaho, and charged with conspiracy to riot at a Pride event. Experts warned that extremist groups could see anti-gay rhetoric as a call to action.

The previous month, a fundamentalist Idaho pastor told his small Boise congregation that gay, lesbian and transgender people should be executed by the government, which lined up with similar sermons from a Texas fundamentalist pastor.

Since 2006, there have been 523 mass killings and 2,727 deaths as of Nov. 19, according to The Associated Press/USA Today database on mass killings in the U.S.

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Bedayn is a corps member for The Associated Press/Report for America Statehouse News Initiative. Report for America is a nonprofit national service program that places journalists in local newsrooms to report on undercovered issues.

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Associated Press reporters Colleen Slevin in Denver, Michael Balsamo in Washington, Jamie Stengle in Dallas, Jeff McMillan in Scranton, Pennsylvania, and Matthew Brown in Billings, Montana, contributed.