Al-Qaeda Chief Al-Zawahiri Killed by America after 21 years

After Obama Bin Laden, Al-Qaeda Chief Al-Zawahiri was the next target of America, which was shot dead on Tuesday. America was finding Al-Qaeda Chief Al-Zawahiri for 21 years because he was the mastermind of the 9/11 attack in New York. What is the whole matter, know in this video.