The killers were assumed to be rival Egyptians.
( ( The killers ) ( ( were ( assumed ( to ( be ( rival Egyptians ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS killers)) (VP (VBD were) (VP (VBN assumed) (S (VP (TO to) (VP (VB be) (NP (JJ rival) (NNS Egyptians))))))) (. .)))
Rival Egyptians were assumed to be the culprits behind the killings.
( ( Rival Egyptians ) ( ( were ( assumed ( to ( be ( ( the culprits ) ( behind ( the killings ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Rival) (NNP Egyptians)) (VP (VBD were) (VP (VBN assumed) (S (VP (TO to) (VP (VB be) (NP (NP (DT the) (NNS culprits)) (PP (IN behind) (NP (DT the) (NNS killings))))))))) (. .)))