9.11 documentary series about FBI agent's hunting terrorists

Thank's for the reply. I had already checked out about half of the documentaries on the list. Now I have checked the other ones and none of them seem to be right:

"9/11: One Day in America"
[Is a series, but doesn't focus on the hunt for the terrorists.]

"9/11: Inside the President's War Room"
[Is a movie and only focuses on George W. Bush.]

"Turning Point: 9/11 and the War on Terror"
[It is a series and I thought that this could be the right one. It turns out that I have seen it, but it isn't the one.]

"Spike Lee's NYC Epicenters 9/11➔2021½"
[This is a series, but is focused on survival in NYC, not specifically 9/11.]

"Ten Steps to Disaster: Twin Towers"
[Is a series, but only one episode is about 9/11, the rest i about other disasters.]

"Stories from the Stage: Changed Forever 9/11"
[This is a series, but only one episode is about 9/11.]

"Rebuilding Hope: The Children of 9/11"
[This is a movie about 4 children, that lost their fathers in 9/11.]

"Memory Box: Echoes of 9/11"
[This is also a movie.]

"Women of 9/11: A Special Edition of 20/20 with Robin Roberts"
[This is also not a series and only focuses on women.]

"Too Soon: Comedy After 9/11"
[This is a movie that focuses on comedy in the aftermath of 9/11.]

"No Responders Left Behind"
[This is a movie about a social activist that wanted to help first responders get health and compensation for the toxins that they were subjected to.]

"The 26th Street Garage: The FBI's Untold Story of 9/11"
[It is about FBI, but it is still a movie and focuses on one specific location.]

"9/11: The Legacy"
[Also a movie.]

"Rise and Fall: The World Trade Center"
[A movie that only focuses on the history of the buildings.]

"9/11: Four Flights"
[A movie that only focuses on the hijacked flights.]

"9/11: I Was There"
[A movie with recordings from different people that was there.]