The mass shooting at a country-music concert in Las Vegas late Sunday is the worst ever to happen in the U.S.

It is the deadliest attack on U.S. soil since the September 11, 2001 attacks on New York and Washington, D.C.

These are the top 10 mass shootings:

1. Las Vegas: Oct. 1, 2017.

58 killed and more than 515 wounded.

Shooter: 64-year-old Stephen Paddock.

Motive: Unknown.

2. Orlando, Fla.: June 12, 2016.

49 people killed and more than 58 wounded.

Shooter: 29-year-old Omar Mateen.

Motive: Terror, hate crime.

3. Blacksburg, Va.: April 16, 2007

33 killed (including the shooter) and 17 wounded on the campus of Virginia Tech.

Shooter: 23-year-old Seung-Hui Cho.

Motive: Mental-health issues.

4. Newtown, Conn.: Dec. 14, 2012

28 killed, including shooter and his mother along with 20 children aged 6 and 7, and 2 wounded at Sandy Hook Elementary School.

Shooter: 20-year-old Adam Lanza.

Motive: Mental-health issues.

5. Killeen, Texas: Oct. 16, 1991

24 killed (including shooter) and 27 wounded.

Shooter: 35-year-old George Hennard.

Motive: Hatred of women, ethnic minorities.

6. San Ysidro, Calif.: July 19, 1984

22 killed (including shooter) and 19 wounded.

Shooter: 41-year-old James Huberty.

Motive: Mental-health issues.

7. Austin, Texas: Aug. 1, 1966

18 killed (including shooter) and 31 wounded in what became known as the University of Texas tower shooting.

Shooter: 25-year-old Charles Whitman.

Motive: Mental-health issues, although a brain tumor was found after his death.

8. Edmond, Okla.: Aug. 20, 1986

15 killed (including shooter) and 6 wounded.

Shooter: 44-year-old postal worker Patrick Sherill.

Motive: Revenge after a workplace supervisory reprimand. The incident inspired the phrase “going postal.”

9. San Bernardino, Calif.: Dec. 2, 2015

16 killed (including 2 shooters) and 24 wounded.

Shooters: 28-year-old Syed Rizwan Farook and Tashfeen Malik, his wife.

Motive: Terror after shooters were radicalized online and committed to jihadism.

10. Fort Hood, Texas: Nov. 5, 2009

13 killed and 33 wounded.

Shooter: Nidal Hasan.

Motive: Uncertain, although the shooter and his family have described it as terror inspired by radical Islam.