 Complete the following phrase:  On September 11, 2001, 19 Al-Qaeda members hijacked four passenger jets within the Northeastern United States in a series of coordinated terrorist attacks. Two planes crashed into the Twin Towers of the World Trade Center in New York City, the third into the Pentagon in Arlington County, Virginia, and the fourth inadvertently into a field near Shanksville, Pennsylvania. The attacks cost the lives of 2,996 people including the 19 hijackers, caused the 