Investigators are examining turbulence as one of the possible causes of the Turkish Airlines crash that killed nine people and injured more than 100 near Amsterdam's main airport, a spokesman said yesterday.

A Turkish pilots' group claimed that turbulence from a large plane landing at Schiphol airport shortly before the doomed flight, which was carrying 135 passengers and crew from Istanbul, may have caused the crash.

Turkey Airline Pilots' Association Secretary-
General Savas Sen said a large Boeing 757 had landed at Schiphol two minutes earlier. Sen said that plane is likely to have "wake turbulence" that hampered the Turkish aircraft's landing.