(CNN) Federal prosecutors have expanded their probe beyond the Boeing 737 Max aircraft to the Boeing 787 Dreamliner, The Seattle Times reported Friday, citing two sources familiar with the investigation.

The Department of Justice subpoenaed Boeing for records pertaining to the Dreamliner's production in South Carolina amid claims of subpar work, the sources told the Times.

A third source told the Times that several individual employees at the Dreamliner production plant in North Charleston, South Carolina, had received subpoenas in early June from the "same group" of prosecutors working on the 737 Max investigation.

A Boeing spokesperson told CNN, "We don't comment on legal matters." Department of Justice spokesperson Peter Carr declined to comment.

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