Reuters reports the plane may have glided down into the ocean, as opposed to diving into the ocean, changing where the search zone should be.
This isn't the first critical report about the investigation. Last month, The Sydney Morning Herald reported an Australian aviation expert believed the search area was off by thousands of miles. Family members of those on board have also expressed concerns over how the investigation is being handled.
"Yeah, we heard this plane disappeared, but until now, we don't know what happened. We don't know why it happened. There is this huge gap in between, and I think without knowing why it happened or what happened, we're just in limbo," a family member of a woman on board told BBC.
Reuters' report cites the project director with the engineering group participating in the search, but the company issued a statement after the report came out, saying that based on scientific data it's been "thoroughly looking in the most probable place – and that is the right place to search."
Countries involved in the search are expected to meet this week to determine the future of the investigation.
This video includes images from Getty Images.