The US Democratic presidential candidates expressed outrage that mass shootings have become chillingly common nationwide, and its law should be amended.

Iran Press/America: "It's not just today, it has happened several times this week. It's happened here in Las Vegas where some lunatic killed 50 some odd people," Vermont Sen. Bernie Sanders said as he and 18 other White House hopefuls were in Nevada to address the nation's largest public employees union.

"All over the world, people are looking at the United States and wondering what is going on? What is the mental health situation in America, where time after time, after time, after time, we're seeing indescribable horror," Sanders added according to the Washington Post.

Sanders blasted Republican Senate leadership for being "more concerned about pleasing the NRA ( National Rifle Association ) than listening to the vast majority of the American people" and said that US President Donald Trump has a responsibility to support commonsense gun safety legislation.

A gunman who opened fire at a shopping centre in El Paso on Saturday killed 20 people. At least 26 people were injured in this incident.

The United States has about 2 percent of the world's population, is home to nearly 31  percent of all massacres worldwide. Experts often consider citizens' freedom to carry weapons to be the most important factor behind the phenomenon. 104/216

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20 people killed & 26 injured in El Paso shooting rampage