273 mass shootings in 275 days. That’s almost one mass shooting per day.
According to a letter penned by Democratic minority leader Nancy Pelosi, this is the reality in the United States. With the recent Las Vegas shooting, many questions have arisen about gun regulations and the frequency of mass shootings.
I first came across Pelosi’s claim on Twitter, where she tweeted a picture of her letter urging Paul Ryan to consider gun control legislation, citing various statistics.

Of note in this letter are the following statistics:
“Nearly 12,000 Americans have been killed by guns in 273 mass shootings in 2017 — one for each day of the year.”
At the time of her letter (October 2), there had been 275 days in the year, and, according to her, 273 mass shootings in which 12,000 Americans had died. Nowhere in her letter did Pelosi cite where these statistics came from.
I decided to look for previous work surrounding Pelosi’s claim, a strategy proposed by Michael Caulfield in his book Web Literacy For Student Fact Checkers. This involves searching for fact-checks that have already been done.
I typed in the following on Google: 273 mass shootings in 275 days. I was hoping these eyebrow-raising keywords would bring up some results.
A Politifact article fact-checked some of the claims in Pelosi’s statement, including her statement that 12,000 Americans had died in 273 mass shootings. According to the site, Pelosi’s article incorrectly reported that these 12,000 deaths happened in 273 mass shootings. Rather, this figure refers to the total gun deaths (suicides excluded) in 2017, with 273 mass shootings adding to this total figure. While Politifact noted that Pelosi’s spokesman published a corrected letter, the original is still accessible on her Twitter account.
Sometimes it behooves a fact checker to verify the credibility of other fact checkers, so I decided to read laterally (borrowing another Caulfield startegy) and get a sense for the perceived accuracy of Politifact. The organization Media Bias/Fact Check files Politifact under its “Least Biased” category, noting its “minimal bias.” 
Media Bias/Fact Check also conducted a poll, asking respondents to rate Politfact’s trustworthiness. The greatest percentage (41.38%) rated it as least biased, with the rest of the percentages spread out amongst the political spectrum in small intervals (i.e. Left-Center at 15.87%, Extreme Left at 15.69%). Going off of these evaluations, it can be concluded that the information provided on Politifact is rather sound.
In the aforementioned Politifact article, a good point is raised. Certain politicians will use different definitions of a mass shooting in the furtherance of political aims.
It seemed necessary to dig deeper and see what is considered a mass shooting, and what isn’t.
According to the Washington Post Fact Checker, there is no universal consensus on what defines a mass shooting. Since the 1980s, the FBI has considered a mass shooting to be an event where four or more individuals are killed in the same general location. Further, Congress defined a mass shooting as three or more killings in a public place, following the Newtown shooting in 2012.
At this point, I wanted to get some insight into the actual shootings that occurred throughout the year. I Googled “list of 2017 mass shootings,” and found a Mother Jones article that cataloged them.
Mother Jones found that there have been a total number of 7 mass shootings, up to and including the Las Vegas massacre. 80 deaths in total are reported here.
Wait a minute… didn’t Nancy Pelosi say there had been 273 mass shootings?! What’s going on?
Mother Jones used the Congressional definition of a mass shooting, meaning three or more people killed in a single location.
Articles from Newsweek, The Toledo Blade, and Business Insider all referenced the Gun Violence Archive as the source of the 273 mass shootings statistic, the same number cited by Pelosi. Since this is where the vast majority of publications gathered their data from, I assumed that Pelosi either had referenced the Gun Violence Archive data or seen a separate report that references it, as I could find no other source cataloging and claiming to have found for themselves this exact number.
Like Mother Jones, the Gun Violence Archive keeps a running tab of its own on mass shootings.
There is a noticeable difference between the two: the Gun Violence Archive counts injuries toward the number of four or more. In the fourteen “mass shootings” counted by the site prior to the Las Vegas shooting, only one of them meets Congress’s definition and none meet the FBI’s, since they are below the cutoff.
Concerning the Gun Violence Archive, I decided to go upstream to find the origins of the project. This Slate article details the beginnings of it, which was started on Slate.com itself. The site notes that it passed the reins onto an individual named Michael Klein, who, at the time (2013), was launching the project under the name Gun Violence Archive.
Reading laterally came in handy here to help me get an idea on what the consensus concerning Slate, the site where the archive originated, seems to be.
This chart from the Pew Research Center places Slate alongside the New Yorker as having the most liberal audience of those publications evaluated.
Having a liberal audience does not automatically mean the publication has a left-wing bias. However, Media Bias/Fact Check categorizes Slate as having a left bias:
Another bias evaluation site, All Sides, also reports a left lean in Slate’s coverage.
The Gun Violence Archive claims that it is not an advocacy group, reporting strictly the facts in an unbiased manner. Its origins at the politically left-leaning Slate.com call this into question.
Michael Klein was listed as the founder of the Gun Violence Archive project. I decided to read laterally and find more information about him.
According to his own website, Klein is also the founder of The Sunlight Foundation, which is “trying to improve the transparency and thus the accountability and performance of our government, with a particular focus on the Congress.” I couldn’t find a list of donations to the Gun Violence Archive, so I figured Klein’s other foundation and its donors would be worth looking into.
The Sunlight Foundation lists where its funds come from. The biggest donation of the year, by a huge margin, came from Bloomberg Family Foundations, Inc, totaling $733,576. This was founded by billionaire Michael Bloomberg, a noted gun control activist who uses his massive funds to contribute to gun advocacy groups and aid in the opposition of NRA-sponsored legislation. This CNN article covers some of his efforts in detail.
Fact checking Pelosi’s claim was a winding road. I ended up learning about different definitions of mass shootings, which can be used in various scenarios for one’s own aims. Pelosi utilized the Gun Violence Archive and its findings of an alarming 273 mass shootings in 275 days, although this number includes injuries and strays away from the more accepted definitions by the FBI and Congress, which go by four and three deaths in a single location, respectively. Looking into the supposedly non-advocacy group, the Gun Violence Archive, turned up useful information. The group began on the left-leaning Slate.com and was taken over by Michael Klein, whose other major foundation received a large sum of money from known gun-control opponent Bloomberg Family Foundations, Inc.
Technically, Nancy Pelosi did not lie when she made her claim. However, she cherry-picked a statistic from a decidedly anti-gun group that categorizes mass shootings in a non-traditional manner, bloating the number to a headline-making 273 mass shootings, whereas the more accepted definition of a mass shooting means that there were far, far fewer.
















