Americans bought at least 150m guns in decade since Sandy Hook shooting

Estimated number of US gun owners has grown by 20 million in recent years, which experts say may lead to more firearm deaths

Americans bought an estimated 150m guns in the past decade, as a drumbeat of mass shootings and other violence has convinced more people that owning a gun for self-defense will make them safer.

In a country where the leading cause of gun death is gun suicide, public health experts say a growth in gun ownership is likely to lead to more deaths.