Why female shooters are rare

As the investigation continues into why a female shooter opened fire at ...

Posted: Apr 4, 2018 1:11 PM
Updated: Apr 4, 2018 1:11 PM

As the investigation continues into why a female shooter opened fire at YouTube headquarters, data show that it's rare for women to carry out such shootings -- making Tuesday's incident unusual.

The shooting unfolded at the San Bruno, California, company premises when a woman shot and injured three people, and then apparently took her own life, officials said.

About 4% of active shooting incidents involved female shooters between 2000 and 2016, FBI found

There are fewer women behind firearm homicides and mass shootings, research shows

She appeared to have killed herself with a handgun, San Bruno Police Chief Ed Barberini said. The woman has been identified as Nasim Najafi Aghdam, a 39-year-old from San Diego, California.

The motive remains unclear.

Women are rarely behind active shooting incidents, according to data from an FBI study.

The FBI examined active shooter incidents, defined as "an individual engaging in killing or attempting to kill people in a confined and populated area" in the United States. Nine of the 220 incidents that had been identified by the FBI (about 4%) had female shooters, according to the FBI list from 2000 to 2016.

The women in those shootings were usually armed with handguns and opened fire inside colleges, businesses, their current or former workplaces, according to the list.

The latest incident at YouTube may not qualify as a mass shooting or murder as three of the victims are hospitalized with injuries.

But in general, there are less female shooters when it comes to firearm homicides, said Adam Lankford, criminal justice professor at the University of Alabama.

FBI data from 2016 showed that 7.6% murder offenders in 2016 were female.

"Research shows that basically males commit more homicides than females, regardless of the subtype of homicide," Lankford said.

'

When it comes to mass shootings, there isn't one accepted definition. The Gun Violence Archive, which compiles data, defines it as an incident in which an offender shoots or kills four or more people. And the Congressional Research Service's defines it as when the perpetrator kills four or more people, selecting victims randomly and attacks in a public place.

But in those incidents, female mass shooters are rare.

"Men commit the overwhelming majority of mass shootings for basically the same reasons they commit most violent crimes," Dewey G. Cornell, a licensed forensic clinical psychologist and director of the Virginia Youth Violence Project at the University of Virginia, wrote in an email to CNN on Tuesday night.

"Men tend to be more violent than women because of a complex interaction of evolutionary and psycho-social factors. Men tend to be more aggressive and less inhibited by empathy, and men in distress seem to be less willing to turn to others for help," he wrote.

None of the perpetrators behind the 28 mass attacks in 2017 were female, according to a report by the US Secret Service.

A study led by Lankford, published in the journal Violence and Victims, looked at 292 public mass shooters worldwide from 1966 to 2012 and found that only one of those was female.

When asked why women are rarely mass shooters, Lankford said: "We can't really answer that question of differences between male and female offenders because we don't have enough female offenders. The problem, or the good news, is we don't have enough female offenders for a statically significant sample."

But there have been cases where women have carried out deadly mass shootings.

A married couple, Syed Rizwan Farook, and his wife, Tashfeen Malik massacred 14 people at a holiday party in 2015 in San Bernardino, California. Farook had worked with the San Bernardino County health department, which was hosting the party when the attack took place. They were both killed in a shootout with police.

On January 30, 2006, Jennifer San Marco visited her former place of employment, a postal distribution center in Goleta, California, and fatally shot six employees after killing a one-time neighbor.

She then killed herself.

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