Another mass shooting, another US gun control debate

A woman and her child at a 2013 gun rights rally in Utah

In 2018 activists placed 7,000 pairs of shoes in front of the US Capitol, representing the number of children killed by gun violence since the 2012 mass shooting at Sandy Hook Elementary School

A mass shooting that left 19 schoolchildren dead in the deeply pro-gun state of Texas on Tuesday increased pressure on US politicians to take action over the ubiquity of firearms -- but also brought the grim expectation of little or no change.

- More guns, more shootings - Yet data shows the grim national cost of gun crime.