There has been another mass shooting in the United States at least 17 people have been killed at a high school campus in Parkland, Florida. It is the deadliest school shooting since 26 people were killed at Connecticut school Sandy Hook in 2012.
Last year, an attack on a concert in Las Vegas left 58 dead, the worst mass shooting in the US, and again raised questions about gun ownership and whether there should be tougher controls.
About 40% of Americans say they own a gun or live in a household with one, according to a 2017 survey, and the rate of murder or manslaughter by firearm is the highest in the developed world. There were more than 11,000 deaths as a result of murder or manslaughter involving a firearm in 2016.
Preventing the mentally ill from purchasing guns
Barring gun purchases by people on no-fly or watch lists
Allowing concealed carry in more places
Allowing teachers and officials to carry guns in schools