According to statements by Lt. Col. Anthony Shaffer and those of four others , Able Danger had identified 2 of 3 al-Qaeda cells active in the 9/11 attacks ; the ' Brooklyn cell ' linked to " Blind Sheik " Omar Abdel-Rahman , including September 11 attacks leader Mohamed Atta , and three of the 9/11 plot 's other 19 hijackers
September 11 attacks
September 11 attacks
Able Danger