The September 11 attacks were a series of suicide attacks by Al-Qaeda upon the United States. On the morning of the attacks 19 of Al-Qaeda’s terrorists hijacked four jet airliners. The hijackers then crashed two of the airliners into the Twin Towers of the World Trade Center, killing everyone on board and many of those who were working in the buildings. Both of the buildings collapsed within two hours of the collisions. Because of the collapse nearby buildings were damaged, even destroyed. The hijackers crashed the third airplane into the Pentagon which is located in Arlington, Virginia. The fourth plane was crashed into a field near Shanksville in Pennsylvania after some of its passengers attempted to retake control of the plane. Unfortunately there were no survivors from any of the flights. Among the 2752 victims who died in the attacks on the World Trade Center were 343 firefighters and 60 police officers from New York City. Over one hundred people were killed in the attacks on the Pentagon. The majority of casualties were civilians, including nationals of over seventy countries. There was also at least one secondary death; one person was examined to have died from lung disease due to the dust from the collapsed World Trade Center. The United States responded to the attacks by launching the “War on Terror”. Invading Afghanistan to depose the Taliban. Many other countries also strengthened their anti-terrorism by expanding law enforcement powers. Some American stock exchanges stayed closed for the rest of the week following the attacks, and posted enormous losses when reopening. Especially in the airline industries. The destruction of billions of dollars worth caused serious damage to the economy of Lower Manhattan.