Washington based Insight magazine ran a series of articles on international abduction during the same period highlighting Saudi Arabia a number of times[45][46][47][48] Relations between the U.S. and Saudi Arabia were strained after the September 11 attacks in 2001,[according to whom?] when nineteen men affiliated with al-Qaeda, including 15 Saudi nationals, hijacked four commercial passenger jet airliners, crashing two of the planes into the Twin Towers of the World Trade Center in New York City, killing 2,973.