rtokens: The cause of the crash was not yet known .
pos: PRP VBD DT NN NN VBP IN NNP NNP , NNP , CC VBD JJ TO VB IN NNP IN VBG IN VBG TO NNP , NNP .
tokens: He said the cargo flight originated in Grand Rapids , Michigan , and was due to stop at Stephenville for refueling before going to Shannon , Ireland .
ltokens: That 's when the wreckage was discovered , " Snow said .