"Thanks to @NRA lobbyists and lawmakers beholden to them, THIS is what America looks like. THIS is every city, every day," tweeted Shanon Watts, founder of Moms Demand Action for Gun Sense in America, a grassroots organization working to end gun violence.

"Why does this keep happening. And even in my home state. Why is Colorado known for shooting?" another user named Karlie tweeted.

The state of Colorado witnessed a mass shooting in July 2017. Twelve people were killed and 59 others injured in Aurora, a suburb 10 miles (16 km) east of Denver, where a heavily armed gunman burst into a packed theater and sprayed the audience with bullets.

According to the non-profit organization Gun Violence Archive, there have been 299 mass shooting incidents so far this year in the United States. Also on Wednesday, a man shot dead his ex-girlfriend before turning the gun at himself in a murder-suicide attempt in the Manhattan borough of New York City.

An estimated 30,000 Americans die each year from guns, and the country is split on whether to have controls on guns or follow the 1789 Second Amendment of the U.S. Constitution which protects the right of the people to keep and bear arms.

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