Sunday morning's shooting in a rural Texas church is among the deadliest gun massacres in modern U.S. history.
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At least 26 people were killed at the First Baptist Church of Sutherland Springs, about 40 miles southeast of San Antonio.
That ties it with the Sandy Hook school shooting as the fourth-deadliest mass shooting in modern U.S. history.
Four of the five worst gun massacres on the list — including the deadliest, in Las Vegas just over a month ago — occurred in just the past year and a half.
The country "has experienced an increase in mass casualty attacks" wrought by mentally troubled individuals "who commit mass murder in furtherance of some perceived grievance or ideological cause," John Cohen, a former counterterrorism coordinator for the Department of Homeland Security and a consultant for ABC News, said after the massacre in Las Vegas, which killed 58 people.
ABC News has compiled a list of the 10 deadliest mass shootings.
1. Route 91 Harvest Festival, Las Vegas – 58 deaths – Oct. 1, 2017
Stephen Paddock, from Mesquite, Nevada, was identified by authorities as the shooter holed up in a Mandalay Bay Resort and Casino hotel suite, packing as many as 19 guns. Around 10 p.m. he opened fire on thousands of country music concert attendees across the street below, killing 59 people; more than 500 others were injured.
2. Pulse nightclub, Orlando, Florida – 49 deaths – June 12, 2016
Around 2 a.m. Omar Mateen, a 29-year-old former security guard, opened fire and killed 49 people who were in an Orlando gay nightclub called Pulse. During the rampage, Mateen, a U.S. citizen, was killed by responding police in a shootout. His ISIS-inspired hate crime injured more than 50 other people. Law enforcement sources told ABC News that Omar Mateen's wife, Noor Mateen, had tried to dissuade him from committing the act. She was charged with aiding and abetting him, as well as committing obstruction. Noor Mateen has pleaded not guilty.
3. Virginia Tech University, Blacksburg, Virginia - 32 deaths - April 16, 2007
Virginia Tech senior Seung-hui Cho, 23, purchased a 9-mm Glock handgun on March 13, 2007, and a .22-caliber gun within a week before he started shooting people at the Blacksburg campus, including five professors and 26 fellow students. The South Korean–born Cho began his rampage in a dorm room, where two students were shot and killed. According to police, he rearmed at his dorm room and left a note before going out and killing 30 more people in four classrooms, He then turned a gun on himself.
4. Sandy Hook Elementary School, Newtown, Connecticut – 26 deaths – Dec. 14, 2012
Adam Lanza was 20 years old when he entered Sandy Hook Elementary School wearing a bulletproof vest and armed with a semiautomatic rifle and two semiautomatic handguns — a Glock and a Sig Sauer. He breached the school by shooting out a window pane of the front office, then gunned down and killed 26 people, including 20 first-graders and six adult school staff members. Not included in the death count is Lanza's mother, Nancy Lanza, who police say was slain before he arrived at the school, as well as Adam Lanza, who took his own life at the school.
4 (tied). First Baptist Church, Sutherland Springs, Texas – at least 26 deaths – Nov. 5, 2017
At least 26 people were killed and 20 others were injured when a shooter opened fire at the First Baptist Church of Sutherland Springs. Further details of the shooting in the rural community, about 30 miles southeast of San Antonio, were not immediately clear.
6. Luby's Cafeteria truck ramming and shooting, Killeen, Texas – 23 deaths – Oct. 16, 1991
After slamming his Ford Ranger truck into the window of Luby's Cafeteria, 35-year-old George Jo Hennard said, according to The Killeen Daily Herald, "This is what the women of Bell County made me do." He then started firing his guns and murdered 23 people and left 20 more wounded. Ten of Hennard's victims were killed by single shots to the head. Once police responded, Hennard retreated to a restroom, where he killed himself.
7. McDonald's, San Ysidro, California – 21 deaths – July 18, 1984
James Oliver Huberty entered the fast food restaurant armed with a long-barreled Uzi, a pump-action shotgun and a handgun and took the lives of 21 adults and children and injured 19 others, including an elderly person and a baby, according to The San Diego Tribune. An hour after the shootings, a police sharpshooter killed Huberty, reported the Tribune. Before he went out to commit mass murder, he reportedly told his wife, "I'm going hunting ... hunting for humans," according to The New York Daily News.
8 (tied). University of Texas, Austin, Texas – 14 deaths – Aug. 1, 1966
U.S. Marine sniper Charles Joseph Whitman lugged a cache of rifles, pistols and a sawed-off shotgun up to the observation deck of the university's landmark clock tower. He then fired at will, striking unsuspecting students. He killed 14 people and wounded at least 30 others.
Whitman's terror was ultimately foiled after police officers Ramiro Martinez and Houston McCoy shot him dead.
Including the murders of his wife and mother, whom he killed earlier that day, the death toll stands at 16.
8 (tied). Inland Regional Center, San Bernardino, California – 14 deaths – Dec. 2, 2015
Husband and wife Syed Rizwan Farook, 28, and Tashfeen Malik, 27, dressed in tactical gear and armed themselves with assault rifles and pistols when they entered a mandatory Christmas party at a social services center where Syed worked, fatally shot 14 of his unarmed colleagues and left at least 17 others injured.
On the day of the attack, FBI agents later confirmed, the couple researched ISIS leader Abu Bakr al-Baghdadi online.
8 (tied). Edmond Post Office, Edmond, Oklahoma – 14 deaths – Aug. 20, 1986
Patrick Henry Sherrill, 44, was a part-time postman who returned to his office a day after receiving a poor performance review. Armed with three handguns, he entered the federal building through the back and shot anyone in sight. He murdered 14 fellow postal workers 10 minutes before fatally shooting himself in the head. Authorities later determined Sherrill was angry that he might lose his job.
ABC News' Meghan Keneally and Chris Donovan contributed to this report.