Explain how al-Qaida was able to establish terrorist cells within the United States capable of carrying out these attacks without detection.Go to the DHS Website https://www.dhs.gov/about-dhs. Click: MISSION. Pick a mission and comment on it. For example, if it is Prevent Terrorism and Enhance Security, explain what is being done. Perhaps write about a recent terrorist act in the U.S., or explain what measures are used by businesses, hospitals, schools, etc. Apa format and double spaced