The President emphasized to us that he had authorized the shootdown of hijacked aircraft.
( ( The President ) ( ( ( emphasized ( to us ) ) ( that ( he ( had ( authorized ( ( the shootdown ) ( of ( hijacked aircraft ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP President)) (VP (VBD emphasized) (PP (TO to) (NP (PRP us))) (SBAR (IN that) (S (NP (PRP he)) (VP (VBD had) (VP (VBN authorized) (NP (NP (DT the) (NN shootdown)) (PP (IN of) (NP (JJ hijacked) (NN aircraft))))))))) (. .)))
Military forces took down the hijacked aircraft, killing the terrorists.
( ( Military forces ) ( ( ( ( ( took down ) ( the ( hijacked aircraft ) ) ) , ) ( killing ( the terrorists ) ) ) . ) )
(ROOT (S (NP (JJ Military) (NNS forces)) (VP (VBD took) (PRT (RP down)) (NP (DT the) (JJ hijacked) (NN aircraft)) (, ,) (S (VP (VBG killing) (NP (DT the) (NNS terrorists))))) (. .)))