Las Vegas police respond during an active shooter situation on the Las Vegas Strip near Tropicana Avenue in Las Vegas. Image Credit: AP

WASHINGTON: After a gunman killed more than 50 people at a Las Vegas concert Sunday, here are some of the deadliest mass shootings in the United States in the past 25 years.

Florida club: 49 killed 

An aerial view shows the Pulse gay nightclub after a mass shooting in Orlando, Florida, June 12, 2016.

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

South Florida residents hold a candle vigil 'Pulse Day of Remembrance' to remember the one year anniversary of the tragic Pulse Nightclub Shooting - which claimed the lives of 49 victims, in Orlando FL. at AmericanAirlines Arena in Miami on Tuesday, June 12, 2017.

The attacker is killed in a shootout with police; he pledges allegiance to the Islamic State group, which later claims responsibility.

Virginia Tech: 32 killed  

Law enforcement officers arrive at Virginia Tech University shooting scene.

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.

A frame grab taken from a video that Virginia Tech gunman Cho Seung-Hui allegedly mailed to NBC between Cho's first and second shootings on the Virginia Tech campus.

Sandy Hook: 26 killed 

A young boy is comforted outside Sandy Hook Elementary School after a shooting in Newtown, Connecticut.

A disturbed 20-year-old man 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.

California office party: 14 dead 

The husband and wife team Syed Rizwan Farouk and Tashfeen Malek involved in the mass shooting in San Bernardino, California on December 2, 2015.

A newlywed radicalised Muslim couple storm an Christmas office party at a social services center in San Bernardino in December 2015 and gun down 14 people, wounding 22 others. They are shot dead by police.

Fort Hood military base: 13 dead 

Nidal Malik Hasan, the shooter at Fort Hood, Texas.

In November 2009 a US army psychiatrist opens fire at his military base in Killeen, killing 13 people and wounding 42, before being overpowered by police.

New York immigrant center: 13 dead 

Authorities stand watch at the scene of shooting on Friday in Binghamton, New York.

A Vietnamese immigrant shoots dead 13 people at a civic center in the New York state city of Binghamton in April 2009, before killing himself.

Marines: 12 dead 

A helicopter lifts a person off the roof as police respond to the shooting at the Navy Yard in Washington, DC on September 16, 2013.

A troubled former serviceman shoots randomly at workers at the Washington Navy Yard headquarters in September 2013, killing 12 people before he is shot dead by officers.

Denver cinema: 12 dead

Denver cinema shooter James Holmes appears in court in Colorado.

A young man wearing body armor storms a cinema showing a late-night premiere of a Batman film in Aurora in July 2012, opening fire and releasing tear gas. Twelve people and 70 wounded. He is sentenced to life in prison.

Columbine High: 12 dead 

Two teenage boys shoot and kill 12 classmates and a teacher at Columbine High School in Littleton, Colorado, in April 1999, before killing themselves.