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))))))))))) (. .)))
Callers stated that there were casualties aboard.  
( Callers ( ( stated ( that ( there ( were ( casualties aboard ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Callers)) (VP (VBD stated) (SBAR (IN that) (S (NP (EX there)) (VP (VBD were) (NP (NP (NNS casualties)) (ADVP (IN aboard))))))) (. .)))