SNIPPET: "In fact, Mower said, the pilot described it as "a serious security risk." Mower was unable to see the man who was taken off the plane, she said. " SNIPPET: "Two sources confirmed to Fox News that the man in question, a citizen of Gambia, had been added to the no-fly list while Flight 215 was in the air. The man had already been on the Terrorist Identities Datamart Environment list, which is comprised of more than 500,000 people with even limited ties to known terrorists, one source said."