WorldUS Commemorates 25th Anniversary of 9/11, Its Deadliest Terrorist Attack

The United States is commemorating the victims of the September 11 attacks 25 years after al-Qaeda terrorists hijacked four passenger planes and used them as weapons. A total of 2,977 people were killed in New York, Washington, D.C., and Pennsylvania, making 9/11 the deadliest terrorist attack on U.S. soil.