Tuesday's school attack in Uvalde, Texas, where at least 19 children and a teacher were killed is just the latest in an unrelenting series of massacres across the US.
Many remember the 1999 Columbine High School shooting, where 13 were killed, as the forerunner of mass shootings, but deadlier massacres have occurred since then.
Here is a look of 10 events that shocked the nation:
2017 music festival shooting in Las Vegas
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People scramble for cover at the Route 91 Harvest country music festival after gunfire was heard on October 1, 2017 in Las Vegas, Nevada. David Becker / Getty Images -
Festival goers run for their lives. David Becker / Getty Images -
Las Vegas police stand guard along the streets near the concert. David Becker / Getty Images -
A body is covered with a sheet in the intersection of Tropicana Avenue and Las Vegas Boulevard South after a mass shooting at a music festival on the Las Vegas Strip in Las Vegas. Steve Marcus / Las Vegas Sun / Reuters -
Las Vegas Metro Police officer stands by at a staging area in the junction of Tropicana Avenue and Las Vegas Boulevard South. Steve Marcus / Las Vegas Sun / Reuters -
Police run to cover at the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Sunday, Oct. 1, 2017, in Las Vegas. Multiple victims were being transported to hospitals after a shooting late Sunday at a music festival on the Las Vegas Strip. (AP Photo/John Locher) -
Medics treat the wounded as Las Vegas police respond during an active shooter situation on the Las Vegas Strip. Chase Stevens / Las Vegas Review-Journal via AP -
Police officers and medical personnel stand at the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip. John Locher / AP Photo -
Police officers stand at the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip. John Locher / AP Photo -
A police officer takes cover behind a truck at the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip. John Locher / AP Photo -
Police officers advise people to take cover near the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Sunday, Oct. 1, 2017, in Las Vegas. (AP Photo/John Locher) -
A police officer takes cover behind a police vehicle during a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip. John Locher / AP Photo -
Police officers enter the Mandalay Bay resort and casino during a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip. John Locher / AP Photo -
Police officers take cover near the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip. John Locher / AP Photo -
A police officer runs along a sidewalk near a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip. John Locher / AP Photo
The country's deadliest mass shooting caused 58 deaths after a gunman opened fire at the Route 91 Harvest music festival on the Las Vegas strip in Nevada. More than 540 people were injured.
The gunman shot himself in the hotel suite from which he was shooting and a motive was never uncovered.
2016 Pulse nightclub shooting in Orlando
Forty-nine people were killed at Pulse, a gay nightclub, by a gunman in Orlando, Florida. The shooting took place during Pride month in June, a time when LGBTQ+ people celebrate their community.
The shooter was fatally shot by police.
2007 Virginia Tech University shooting
Thirty-two people were killed in a mass shooting at a university in Blacksburg, Virginia. The gunman killed himself.
2012 Sandy Hook school shooting in Newtown, Connecticut
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A police officer leads two women and a child from Sandy Hook Elementary School. Shannon Hicks / AP Photo/Newtown Bee. -
The latest attack comes less than two weeks before Christmas. It appeared to be the nation's second-deadliest school shooting, exceeded only by the Virginia Tech massacre in 2007. Alex von Kleydorff / AP -
A woman weeps as she arrives to pick up her children. AP -
A candlelight vigil in Times Square, for the victims. Carlo Allegri / Reuters -
The families of victims grieve. Adrees Latif / Reuters -
The latest attack comes less than two weeks before Christmas. It appeared to be the nation's second-deadliest school shooting, exceeded only by the Virginia Tech massacre in 2007. Andrew Gombert / AP -
A woman waits to hear about her sister, a teacher. Jessica Hill / AP
A gunman entered a primary school in Newtown, Connecticut, and killed 26 people.
Twenty children aged between 5 and 10 years old were among those dead. There were louder calls for gun control action shortly afterwards, as tragic photos of young children were published.
2017 church shooting in Sutherland Springs, Texas
A former member of the US Air Force killed 26 churchgoers at First Baptist Church in Sutherland Springs, Texas.
He was let go from the force for beating his wife and child, and the church he attacked was one attended by his in-laws.
2019 Walmart shooting in El Paso, Texas
Twenty-three people shopping at a Walmart store in El Paso, Texas, were killed by a gunman.
The Mexican government at the time tried to have the US government of then-president Donald Trump call the border event an act of terrorism.
2018 Marjory Stoneman Douglas school shooting in Florida
Seventeen pupils and teachers were killed by a former pupil at Marjory Stoneman Douglas High School in Parkland, Florida.
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Students from the Marjory Stoneman Douglas High School evacuate the school following a shooting. WPLG-TV via AP -
Students react following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018. A gunman opened fire at the Florida high school, an incident that officials said caused "numerous fatalities" and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg -
A law enforcement officer rushes toward Marjory Stoneman Douglas High School following a shooting at the school in Parkland, Fla., on Wednesday, Feb. 14, 2018. (John McCall/South Florida Sun-Sentinel via AP) -
Family member embrace following a shooting at Marjory Stoneman Douglas High School, Wednesday, Feb. 14, 2018, in Parkland, Fla. (AP Photo/Wilfredo Lee) -
A law enforcement officer directs traffic outside the school following a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., on Wednesday, Feb. 14, 2018. (John McCall/South Florida Sun-Sentinel via AP) -
Students are evacuated from Marjory Stoneman Douglas High School during a shooting incident in Parkland, Florida, U.S. February 14, 2018 in a still image from video. WSVN.com via REUTERS. ATTENTION EDITORS - THIS IMAGES HAS BEEN PROVIDED BY A THIRD PARTY. NO RESALES, NO ARCHIVES. MANDATORY CREDIT. NO ACCESS SOUTHEAST FLORIDA MEDIA. -
Anxious family members wait for information on students, Wednesday, Feb. 14, 2018, in Parkland, Fla. A shooting at Marjory Stoneman Douglas High School sent students rushing into the streets as SWAT team members swarmed in and locked down the building. Police were warning that the shooter was still at large even as ambulances converged on the scene and emergency workers appeared to be treating those possibly wounded. (AP Photo/Wilfredo Lee) -
A law enforcement officer talks with students, Wednesday, Feb. 14, 2018, in Parkland, Fla. A shooting at Marjory Stoneman Douglas High School sent students rushing into the streets as SWAT team members swarmed in and locked down the building. Police were warning that the shooter was still at large even as ambulances converged on the scene and emergency workers appeared to be treating those possibly wounded. (AP Photo/Wilfredo Lee) -
Police officers ride in the back of a pick up truck as they tend to a victim following a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., on Wednesday, Feb. 14, 2018. (John McCall/South Florida Sun-Sentinel via AP) -
Rescue workers prepare to transport a victim on a stretcher near Marjory Stoneman Douglas High School following a shooting incident in Parkland, Florida, U.S. February 14, 2018 in this still image taken from a video. WSVN.com via REUTERS. ATTENTION EDITORS - THIS IMAGES HAS BEEN PROVIDED BY A THIRD PARTY. NO RESALES, NO ARCHIVES. MANDATORY CREDIT. NO ACCESS SOUTHEAST FLORIDA MEDIA. -
A woman consoles another as parents wait for news regarding a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., Wednesday, Feb. 14, 2018. A shooter opened fire at the Florida high school Wednesday, killing people, sending students running out into the streets and SWAT team members swarming in before authorities took the shooter into custody. (AP Photo/Joel Auerbach) -
In this frame grab from video provided by WPLG-TV, emergency personnel wheel an injured person from the Marjory Stoneman Douglas High School in Parkland, Fla., following a shooting there on Wednesday, Feb. 14, 2018. (WPLG-TV via AP) -
A man placed in handcuffs is led by police near Marjory Stoneman Douglas High School following a shooting incident in Parkland, Florida, U.S. February 14, 2018 in a still image from video. WSVN.com via REUTERS. ATTENTION EDITORS - THIS IMAGES HAS BEEN PROVIDED BY A THIRD PARTY. NO RESALES, NO ARCHIVES. MANDATORY CREDIT. NO ACCESS SOUTHEAST FLORIDA MEDIA.
The massacre compelled surviving pupils to launch a national youth movement, holding protests and gatherings calling for gun control, called "March for our Lives".
2022 school shooting in Uvalde, Texas
The newest addition to the top deadliest US mass shootings was on Tuesday, when a gunman killed 19 people at Robb Elementary School.
Texas officials said on Tuesday evening that 19 pupils were killed, along with a teacher. The gunman also shot his grandmother before the rampage, authorities said.
2015 office party shooting in San Bernardino, California
A gunman killed 14 people at an office party in San Bernardino, California.
2009 Binghamton shootings in New York state
Thirteen people were killed in a shooting at the American Civic Association immigration centre in Binghamton, New York. The shooter killed himself.
Reuters contributed reporting. Numbers from Gun Violence Archive.
