Tayseer Allouni is a journalist from the Al Jazeera news channel. He was born in Deir ez-Zor in Syria in 1955 then in 1983 he moved to Spain, where he studied Economics, and has lived there ever since, adopting Spanish citizenship in 1988. He interviewed Osama bin Laden following the September 11, 2001 attacks on the World Trade Center, and was controversially convicted on terrorism-related charges in Spain in 2005.

The September 11 attacks, commonly known as 9/11, were four coordinated Islamist suicide terrorist attacks carried out by al-Qaeda against the United States on September 11, 2001. That morning, 19 terrorists hijacked four commercial airliners scheduled to travel from the East Coast to California. The hijackers crashed the first two planes into the Twin Towers of the World Trade Center in New York City, two of the world's five tallest buildings at the time, and aimed the next two flights toward targets in or near Washington, D.C., in an attack on the nation's capital. The third team succeeded in striking the Pentagon, the headquarters of the U.S. Department of Defense in Arlington County, Virginia, while the fourth plane crashed in rural Pennsylvania during a passenger revolt. The September 11 attacks killed 2,977 people, making them the deadliest terrorist attack in history, and instigated the multi-decade global war on terror, fought in Afghanistan, Iraq, and elsewhere.