On September 11, 2001 four planes were hijacked by terrorists. Two planes crashed into the the twin towers, witch caused the buildings to set fire and collapse. Another plane hit the Pentagon. The fourth one crashed in Shanksville, Pennsylvania. Almost 3,000 people were killed in 9/11.
http://911review.com/attack/wtc/impacts.html
In total there were nineteen terrorists. There leader was Osama bin Laden. They were apart of a group called Al Qaeda. Al Qaeda is an extreme version of Islamic. The terrorists were all from the middle east.
Bin Laden was mad that US troops were sending Islamic people to places like Mecca and Medina. He wanted the US troops to leave the Persian gulf.
The US and its allies invaded Afghanistan where Al Qaeda was based in October 2001. Taliban ran the Afghanistan Government was protecting Bin Laden. They were also letting Al Qaeda run camps in the country. Since then many members have been captured or killed.
I think we should've had better security in the airports so that things like this have to happen. Hopefully this is the first and last time that this happens.
http://www.scholastic.com/browse/article.jsp?id=3756477
http://911billofrights.blogspot.com/2007/04/why-did-911-occur.html

Comments
Brief overall!