The September 11 attacks were a series of coordinated attacks by terrorists on the U.S. On the morning of September 11, 2001 four commercial passenger airlines were hijacked. Two of them were crashed into the Twin Towers of the World Trade Center in NYC and the buildings collapsed. The third one crashed into the Pentagon in Virginia and the 4th crashed into a field in rural Pennsylvania. There were no survivors from any of the flights. In total 2,993 died on that day. Let's remember them today.