As a gunman burst onto the campus of Ohio State University in Columbus, injuring at least nine people, the news was a sobering reminder of the mounting number of mass shootings across the country.

The number of deadly incidents in primary, high schools, colleges and universities is one of the most common types of mass shooting.

Below is a timeline of mass shootings in educational establishments in just over the last 12 months.

1 October 2015: Roseburg, Oregon

A gunman opened fire at Umpqua Community College, killing nine and wounding seven. The suspected shooter, 26- year-old Chris Harper Mercer, shot himself after exchanging gunfire with the police.

23 April 2016: Antigo, Wisconsin

An 18-year-old boy named Jakob Wagner opened fire at the Antigo High School prom. He shot four fellow students. Nobody died from their injuries. He ran from the building, exchanged fire with a police man and was shot down in a field. He died a few hours later in hospital.

1 June 2016: Los Angeles, California

Gunman Mainak Sarkar burst into the UCLA campus, shot and killed an instructor, William Klug, before killing himself. Klug, 39, was a father of two who worked in the mechanical and aerospace engineering department. The killer reportedly left a note for authorities, asking them to feed his cat.

28 September 2016: Townville, South Carolina

Homeschooled 14-year-old Jesse Osborne shot his father dead, then drove to the local primary school playground where he shot two male students and a female teacher.

The teacher and one of the boys were treated and released from the hospital. One boy died. Osborne was charged with murder.

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18 October 2016: San Francisco, California