Worst mass shootings in the United States

Florida club: 49 killed

A heavily-armed gunman opens fire inside a gay nightclub in the city of Orlando on June 12, 2016 and kills 49 people.

The attacker is killed in a shoot-out with police; he pledges allegiance to Islamic State, which later claims responsibility.

Virginia Tech: 32 killed

Cho Seung-hui, a 23-year-old student of Korean origin goes on a rampage at Virginia Tech University in the town of Blacksburg in April 2007. He kills 27 students and five teachers before committing suicide.

Sandy Hook: 26 killed

A disturbed 20-year-old man named Adam Lanza kills his mother in Newtown, Connecticut, in December 2012 before blasting his way into Sandy Hook Elementary School and shooting dead 20 six and seven-year old children and six adults. He commits suicide.

Texas restaurant: 22 dead

In October 1991 a man shoots dead 22 people in a restaurant in the town of Killeen and then kills himself.