NEW : Two Boeing employees -- among four on board -- were killed , company said . Teams of investigators arrived at the crash site just after daybreak and set up a large white tent . NEW : Their identities have not been released . Seven people remained in the hospital , all in critical condition , mayor said . Plane crashed near Amsterdam 's main airport , splitting into two parts .
NEW : Two Boeing employees -- among four on board -- were killed , company said . NEW : Their identities have not been released . Seven people remained in the hospital , all in critical condition , mayor said . Plane crashed near Amsterdam 's main airport , splitting into two parts .