"The relatives have been informed that the missing person will be dead," he told the Associated Press. "We have arranged some help for them."
He also said Thursday that investigators now say 135 passengers and crew were on the flight, not 134 as previously believed, which was one reason it had taken so long to account for the dead.
Flight TK1951 from Istanbul crashed about one mile (1.5 kilometers) short of the runway at Amsterdam's Schiphol Airport on Wednesday morning, smashing into three pieces and spraying luggage and debris across a field.
At the crash site Thursday, investigators took detailed photos of the wreckage, trying to piece together why the plane lost speed and crashed.
On Wednesday, Jim Proulx, a Boeing spokesman in Seattle, identified the four Boeing employees on the flight as Ronald A. Richey, John Salman, Ricky E. Wilson and Michael T. Hemmer.
Proulx said they are from the Puget Sound area of western Washington state, and were traveling on company business.
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