During the course of the morning, there were multiple erroneous reports of hijacked aircraft.
( ( During ( ( the course ) ( of ( the morning ) ) ) ) ( , ( there ( ( were ( ( multiple ( erroneous reports ) ) ( of ( hijacked aircraft ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN During) (NP (NP (DT the) (NN course)) (PP (IN of) (NP (DT the) (NN morning))))) (, ,) (NP (EX there)) (VP (VBD were) (NP (NP (JJ multiple) (JJ erroneous) (NNS reports)) (PP (IN of) (NP (JJ hijacked) (NN aircraft))))) (. .)))
There were no reports at all about the hijacking.  
( There ( ( were ( ( no reports ) ( at ( all ( about ( the hijacking ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBD were) (NP (NP (DT no) (NNS reports)) (PP (IN at) (NP (NP (DT all)) (PP (IN about) (NP (DT the) (NN hijacking))))))) (. .)))