This is the first in a series of articles covering mass shootings and how they are defined in the US.
This article will take a look at which countries have the most mass shootings, according to the number of deaths and injuries caused by the incidents.
According to official figures, there have been 4,074 mass shootings since the beginning of this year.
More than 3,700 people have died in the mass shootings.
Here is how the country ranks in terms of the number and types of mass shootings each year.
Source: The Guardian data: US.gov / Reuters data: AFP / Getty Images