NEW : Suspect initially wanted to stage attack on September 11 , authorities say . A terrorism suspect accused of plotting the bombing of a skyscraper made his first appearance in federal court Friday . Affidavit : Web accused in Dallas bomb plot wrote violent posts on extremist Web site . Teen accused of plotting to bomb Texas skyscraper . Hosam Maher Husein Smadi told plans to undercover FBI agents , authorities say .
NEW : Suspect initially wanted to stage attack on September 11 , authorities say . Affidavit : Web accused in Dallas bomb plot wrote violent posts on extremist Web site . Teen accused of plotting to bomb Texas skyscraper . Hosam Maher Husein Smadi told plans to undercover FBI agents , authorities say .