More than 1 million people are listed in U.S. terrorism database (Washington Post)
The documents obtained by The Intercept also indicated that the government, with the assistance of the CIA, is in the midst of a major effort to obtain biometric data on people in the database. The records say analysts have added 730,000 biometric files to the database; some of those files include fingerprints, iris scans and facial photographs.
As of last year, the database contained 860,000 biometric files related to 144,000 people.
There's a lot of really interesting information at the link.