A gunman who fatally shot five people including himself at an Oklahoma medical building after buying an assault-style rifle the same day had gone there to kill a doctor who he blamed for back pain he felt after surgery, authorities said on Thursday.

At least five people were killed and several others were wounded Wednesday in a shooting on a hospital campus in Tulsa, Oklahoma, police say.

US President Joe Biden says it is up to Congress to pass gun control legislation and outlaw assault weapons.

US Republican Congressman Chris Jacobs has expressed his support for an assault weapons ban after two mass shootings in his hometown of Buffalo, New York, and in Uvalde, Texas.

More than a thousand people have gathered outside the NRA's annual convention in Houston, Texas, to protest gun violence​​​​​​​ in the US.

Gun safety advocates are pushing US President Joe Biden to take stronger measures on his own to curb gun violence after the Texas elementary school shooting.

A vast majority of Americans in a new poll support background checks on all gun sales, one day after the mass shooting at an elementary school in Texas.

Pope Francis has called on the US to act to prevent the spread of guns after a mass shooting at a Texas elementary school.

A gunman has killed 18 young children and three adults at an elementary school in the US state of Texas.

US firearms makers produced over 139 million guns for the commercial market over the two decades from 2000.