Callers reported that a passenger had been stabbed and that two people were lying on the floor of the cabin, injured or dead-possibly the captain and first officer.
( Callers ( ( reported ( ( ( that ( ( a passenger ) ( had ( been stabbed ) ) ) ) and ) ( that ( ( two people ) ( were ( lying ( on ( ( ( ( the floor ) ( of ( ( ( the cabin ) , ) injured ) ) ) or ) ( ( ( dead-possibly ( the captain ) ) and ) ( first officer ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Callers)) (VP (VBD reported) (SBAR (SBAR (IN that) (S (NP (DT a) (NN passenger)) (VP (VBD had) (VP (VBN been) (VP (VBN stabbed)))))) (CC and) (SBAR (IN that) (S (NP (CD two) (NNS people)) (VP (VBD were) (VP (VBG lying) (PP (IN on) (NP (NP (NP (DT the) (NN floor)) (PP (IN of) (NP (NP (DT the) (NN cabin)) (, ,) (VP (VBN injured))))) (CC or) (NP (NP (JJ dead-possibly) (DT the) (NN captain)) (CC and) (NP (JJ first) (NN officer))))))))))) (. .)))
The passengers tried to help the injured.  
( ( The passengers ) ( ( tried ( to ( help ( the injured ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS passengers)) (VP (VBD tried) (S (VP (TO to) (VP (VB help) (NP (DT the) (JJ injured)))))) (. .)))