The mass shooting in El Paso, Texas, on Saturday, that left at least 20 people dead and 26 injured appears to be the deadliest shooting, making it one of the ten worsts in modern American history.
A 21-year old white male, a resident of Dallas-area city of Allen, about 650 miles (1,046km) east of El Paso, was taken into custody after surrendering to officers.
El Paso Walmart rampage on Saturday marked another grim milestone of 250th mass shooting in the first 215 days of 2019.
Although mass shooting does not have an official definition, the various groups and watchdog organizations including FBI defines a mass shooting as an incident in which four or more people, not including the suspect, are killed. But in 2013, a congressional act defined "mass killing" as "three of more killings in a single incident," and labeled mass shooting as a type of mass killing.
There were at least 20 shootings in 2018 that fit these parameters.
Here is a list of ten deadliest single day mass shooting in the history of modern US, dating from recent events to the events of 1949.
The Harvest Music Festival: 58 killed
October 1, 2017 - A gunman, identified as 64-year-old Stephen Paddock, killed 58 people and injured more than 500 is the deadliest mass shooting in modern US history. He fired from the 32nd floor of the Mandalay Bay Resort and Casino on a crowd of more than 20,000 gathered on the Las Vegas Strip for the Route 91 Harvest music festival. Police believe the gunman then killed himself.
Pulse Night Club: 49 killed
June 12, 2016 - Omar Saddiqui Mateen, 29, opened fire inside Pulse, a gay nightclub, in Orlando. At least 49 people were killed and more than 50 injured. Mateen was killed during an operation as police tried to rescue the hostages he was holding inside the club.
Virginia Tech: 32 killed
April 16, 2007 - Seung-Hui Cho, identified as 23-year-old student, went on a shooting spree, killing 32 people in two locations and wounding an undetermined number of others on the campus of Virginia Tech in Blacksburg. Later, he killed himself.
Sandy Hook: 27 killed
December 14, 2012 - Adam Lanza, 20, gunned down 20 children, aged between 6 and 7, and six adults at Sandy Hook Elementary School in Newtown, Connecticut, before turning the gun on himself. Investigators found the shooter's mother, Nancy Lanza, dead from a gunshot wound.
First Baptist Church in Sutherland Springs: 25 and an unborn child killed
November 5, 2017 – A man named Devin Patrick Kelley walked into the first Baptist Church in Southern Springs and shot 25 people and an unborn child to death. He was found dead after a brief chase, but it's unclear whether he is killed or took his own life.
Luby's Cafeteria: 23 killed
October 16, 1991 - In Killeen, Texas, 35-year-old George Hennard crashed his pickup truck through the wall of a Luby's Cafeteria. After exiting the truck, Hennard shot and killed 23 people. He then took his own life.
McDonald's in San Ysidro: 21 killed
July 18, 1984 - 41-year-old James Huberty in San Ysidro, California, armed with a long-barreled Uzi, a pump-action shotgun and a handgun, killed 21 adults and children at McDonald's. A police sharpshooter killed Huberty one hour after the rampage.
Walmart in El Paso: At least 20 killed
August 3, 2019 - Twenty people were killed when a man walked into a Walmart and started firing. According to officials there were up to 3,000 shoppers and 100 employees inside the building at the time of shooting.
University of Texas: 18 killed
August 1, 1966 - Charles J. Whitman, a former US Marine, killed 16 and wounded at least 30 while shooting from a tower at the University of Texas at Austin. Police officers Ramiro Martinez and Houston McCoy shot and killed Whitman in the tower. Whitman killed his mother and wife earlier in the day.
Parkland, Florida: 17 killed
February 14, 2018 - A former student opened fired at Marjory Stoneman Douglas High School. The suspect had been expelled for disciplinary reasons, officials said. He was taken into custody shortly after the attack.