In the US city of Philadelphia, a man wearing a bulletproof vest opened fire, leaving five adults dead and two children injured.

The alleged assailant, 40-year-old Kimbrady Carricker, who is currently in custody and is believed to be transgender, was in possession of an AR-15-style weapon, a revolver, a police scanner, and ammo.

He has no known relationship to the victims, who the police reported ranged in age from 15 to 59.

On Monday, police were called to the Kingsessing neighborhood in the southwest of the city.

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There were 131 mass shootings this year, and there were 647 in 2022, according to data from the Gun Violence Archive. Since 2018, there have been a total of 2,861 mass shootings in the United States. Some crimes have involved multiple offenders.

Over 13-year-old Americans who identify as transgender make up about 0.6 percent of the population, according to the Williams Institute research centre.

One of these shooters eventually came out as non-binary, making a total of three of them transgender. Uncertainty exists regarding the precise number of shooters involved in such occurrences and if there may have been other transgender shooters beyond those named.

Nashville, Tennessee—March 27, 2023

According to a statement released by the Metropolitan Nashville Police Department on Monday, officers were dispatched to the Covenant School, a private Christian school southwest of the city, at about 10:13 a.m. local time in response to reports of gunfire within the structure.

Along with school principal Katherine Koonce, 60, Mike Hill, 61, and Cynthia Peak, 61, three children—Evelyn Dieckhaus, William Kinney, and Hallie Scruggs—were also slain. Police recognized Peak as a substitute teacher and Hill as a janitor.

The suspect, later identified as Audrey Elizabeth Hale, 28, was shot and killed by police after they located him on the second level of the school. Hale, who had previously attended the school, had brought three firearms, including two assault rifles, with him that day.

Colorado Springs, Colorado—November 19-20, 2022

Five people were killed and 25 others were hurt in a mass shooting that started at an LGBTQ nightclub just before midnight. After being named as the shooter, Lee Aldrich, 22, has been named in more than 300 criminal indictments. While awaiting trial, he is still being held.

In court filings, Aldrich’s attorneys claimed that their client identified as non-binary; however, experts and the accused’s neighbours have suggested that this claim may be deceptive. Jared Holt, senior research manager at the Institute for Strategic Dialogue, a group that monitors online extremism, told NBC that he was “immediately skeptical” of the claim.

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Denver, Colorado—May 7, 2019

At the STEM School Highlands Ranch, south of Denver, a shooting left one student dead and eight others wounded.

Before carrying out the attack, Alec McKinney, 16, and Devon Erickson, then 18 years old, entered the school while carrying multiple concealed firearms.

They were then taken into custody by law authorities, and in July 2020, McKinney received a life sentence after admitting guilt. Erickson entered a not guilty plea, but after being found guilty in June 2021, he was given a life sentence without the possibility of release.

Aberdeen, Maryland—September 20, 2018

At a pharmacy distribution centre in the city, which is 26 miles northeast of Baltimore, four people were shot and murdered. Shortly around 9 a.m. ET, the suspect entered the building and started firing before turning the gun on themselves. They later passed away from their injuries.

Police identified the shooter as Snochia Moseley, a girl who was 26 years old. A close friend revealed to the Washington Post that Moseley had bipolar disorder and despair, which they attributed to his first rejection after coming out as gay and later as transgender.

The buddy claimed that Moseley had been having trouble making the transition even though she had started hormone medication a year before the incident and intended to have gender-reassignment surgery.