A gunman killed three people when he opened fire in the food court of a shopping mall outside Indianapolis in the US state of Indiana on Sunday before a bystander fatally shot the assailant.
Two other people were injured in the incident, which took place in the early evening at Greenwood Park Mall, the Indianapolis Star reported, citing Greenwood Police Chief Jim Ison.
The paper reported that police believe a bystander who also had a weapon saw the shooting and opened fire on the gunman.
The shooter was alone and had a rifle and several magazines of ammunition, according to the newspaper.
The shootings occurred amid widespread concerns over the drumbeat of US shootings in schools, workplaces and public areas that regularly make headlines.
A spate of gun massacres since May at a New York grocery store, a Texas elementary school and an Illinois Independence Day parade have renewed fierce US debate over gun regulations.
The US House Judiciary Committee will take up proposed legislation this week that would ban certain assault weapons, the panel said on Friday.
It is not expected to pass the Senate.
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