short of the runway , split the plane into three parts . Watch crash survivors return home '' Weather conditions at the time were favorable . Passengers described feeling the plane suddenly drop before impact , and at least one passenger said he heard the pilot trying to give more power to the engines before the plane went down . Safety Board specialists are analyzing the flight data and voice recorders and expect to finish their work at the crash site this weekend , Sanders said . Pieces relevant to the probe will be brought to a hangar at Amsterdam Schiphol Airport for further analysis . Watch how survivors described crash '' The Safety Board may release preliminary findings next week , Sanders said . The nine dead included five Turks and four Americans , said Theo Weterings , the mayor of Haarlemmermeer municipality , where the airport is located . See where 737-800 has been involved in previous incidents '' There were four Boeing employees on the flight , and three were killed , the company said Friday in a posting on its Web site , citing the U.S. Embassy in Amsterdam as its source . The fourth employee
-LRB- CNN -RRB- -- The Turkish Airlines plane that crashed this week in Amsterdam fell almost vertically to the ground , making only a short track in the muddy farmer 's field where it went down , Dutch investigators said Friday . Dutch investigators continue to probe the crash site for more clues . That sudden drop indicates the aircraft did not have enough forward speed when it crashed , a spokesman for the Dutch Safety Board said , but the reasons for that are still unclear . It is too early to speculate on the cause of the crash , spokesman Fred Sanders told CNN . Reports that it was caused by engine failure are premature , he said . `` There must have been ... reasons why the plane did not get enough speed , '' Sanders said . `` We do n't know yet why this came about , and that 's the main thing that will have to be investigated . '' Wednesday 's crash of Flight 1951 from Istanbul , Turkey , to Amsterdam killed nine and injured more than 60 of the 135 people on board . The crash , less than 500 yards