9/11 for children

The BBC explains 9/11 in terms so simple a child can understand. It seems that “the way America has got involved in conflicts in regions like the Middle East has made some people very angry including a group called al-Qaeda.” Moreover, “when the attacks happened in 2001, there were a number of US troops in a country called Saudi Arabia, and the leader of al-Qaeda, Osama Bin Laden, said he wanted them to leave.” Thus, “al-Qaeda members believe attacking US targets is something they should do.”
Hat tip: Joe Malchow